Gulf of Tonkin, September 1967

The morning sun had barely risen above the eastern horizon when HMAS Australia settled into her patrol station in the Gulf of Tonkin. The sea was unusually calm, its surface broken only by the long white wake of the battleship and the smaller silhouettes of two American destroyers several miles to the southeast.

For the past three days, the Australian flagship had been operating with a United States Navy task group supporting naval operations off the North Vietnamese coast. Her six 14-inch guns had already fired more than a hundred rounds against coastal artillery positions and supply installations. Now, with her ammunition replenished during a brief rendezvous with a fleet supply ship, Australia was returning to her assigned patrol area.

On the bridge, Captain Richard H. Collins studied the morning reports. At fifty-two, Collins was a veteran of the Korean War and had commanded the battleship for nearly eighteen months. He knew her strengths, her weaknesses, and the peculiar demands of operating a vessel originally designed before the Second World War in an age increasingly dominated by supersonic aircraft and guided missiles.

"Weather looks promising, sir," Lieutenant Commander Peter Wallace, the officer of the watch, remarked. "Visibility twenty miles, light winds from the northeast."

Collins nodded. "Let's hope the North Vietnamese appreciate it as much as we do."

A few officers smiled.

Below them, the great ship continued steadily through the water at eighteen knots. Her two forward main turrets were trained slightly to starboard, their massive barrels elevated just above the horizon. Farther aft, the modern 4.5-inch twin mountings stood ready, their automatic loading systems maintained at immediate notice.

On the stern, the ship's Westland Wessex helicopter was secured to its landing deck, its rotor blades folded. A reconnaissance flight had been scheduled for later that morning.

For the moment, the battleship seemed at peace.

That changed at 07:42.

"Air contact! Bearing three-four-zero, range eighty-five miles!"

The announcement came from the radar operations room deep within the superstructure.

Petty Officer Michael Fraser leaned closer to his Type 965 radar display. Two faint returns had appeared at the northern edge of the screen, moving rapidly southward.

"Two aircraft," he continued. "Speed approximately five hundred knots. Altitude estimated fifteen thousand feet. Heading toward the task group."

The radar officer, Lieutenant Commander David Mercer, stepped beside him.

"Identification?"

"Negative IFF response, sir."

Mercer studied the tracks. The aircraft were approaching from the direction of North Vietnam, maintaining a steady course toward the allied formation.

He picked up the communications handset.

"Bridge, radar. Two unidentified fast contacts approaching from the north. Request permission to establish air defence condition one."

The reply came almost immediately.

"Approved."

Within seconds, the ship's internal communication system came alive.

"Action stations! Action stations! Air threat approaching from the north!"

Across Australia, the familiar alarm bells rang.

Sailors hurried through passageways, watertight doors were secured, and the ship's combat systems were brought to full readiness. On the upper decks, personnel moved rapidly toward protected positions.

Deep inside the Sea Slug missile complex, technicians began the final preparation of the weapons.

The enormous modernization programme completed only three years earlier was about to face its first serious test.

The Approaching Threat

At 07:47, the two aircraft were positively identified as North Vietnamese MiG-17 fighters.

Although no longer among the world's most advanced combat aircraft, the MiG-17 remained a dangerous opponent. Its agility, powerful cannon armament and ability to operate at low altitude had already earned it a formidable reputation among American pilots.

The two fighters had been dispatched to investigate reports of a large allied warship operating near the coast. Their pilots had been informed that American destroyers were conducting bombardment operations in the area.

Neither had expected to encounter a battleship.

At the combat information centre aboard Australia, the tracks continued moving south.

"Range sixty-two miles," Fraser reported. "Both aircraft descending. Altitude now ten thousand feet."

Mercer frowned.

"They're coming straight toward us."

On the bridge, Collins received the latest information.

"Have the Americans acknowledged?"

"Yes, sir. Both destroyers have the contacts. No friendly aircraft reported in the area."

Collins looked toward the northern horizon.

"Very well. Maintain tracking. Sea Slug to immediate readiness."

The order passed through the ship.

In the missile control room, Lieutenant James Harrington, the Sea Slug weapons officer, watched the illuminated status indicators change from amber to green.

The Sea Slug system was a remarkable piece of British engineering, but it was far from simple.

Unlike the compact missiles of later generations, each Sea Slug was a massive weapon, more than six metres long, with four solid-fuel boosters surrounding its body. The missiles were stored horizontally within the battleship's extensive magazine complex, occupying much of the space once devoted to aircraft handling facilities.

From there, an automated system moved the missiles toward the launcher installed where the ship's aft 14-inch turret had once stood.

Harrington had spent countless hours supervising exercises and simulated engagements.

Now the targets were real.

"Missile one prepared," reported the loading officer.

"Guidance system?"

"Operational."

"Type 901?"

"Tracking."

Harrington took a breath.

"Sea Slug ready, sir."

First Blood

At 07:53, the MiGs were forty miles away.

They had begun to separate.

One aircraft continued toward the battleship, while the second turned slightly eastward, apparently attempting to approach the formation from a different direction.

"Two independent targets," Mercer reported. "Lead aircraft bearing three-five-two. Second contact bearing zero-one-five."

Collins considered the situation.

The fighters were still beyond effective cannon range, but their intentions were becoming increasingly clear. Both were descending toward the allied ships.

"Transmit warning on guard frequency."

The radio operator repeated the challenge in English and Vietnamese.

There was no response.

A second warning followed.

Still nothing.

At 07:56, the leading MiG accelerated and began a shallow dive toward the formation.

"Lead aircraft now twenty-six miles. Speed five hundred and forty knots."

Collins made his decision.

"Engage the lead aircraft. Sea Slug."

In the missile control room, Harrington immediately responded.

"Sea Slug, target one. Prepare to fire."

The Type 901 fire-control radar locked onto the approaching aircraft, maintaining the tracking data required to guide the missile.

On the aft deck, the great twin-arm launcher swung toward the northern sky.

The weapon looked almost absurdly large compared with the compact Sea Cat launchers scattered around the battleship's superstructure. Yet it had been designed for precisely this task: destroying hostile aircraft before they could reach the fleet.

"Launcher trained."

"Guidance confirmed."

"Missile armed."

Harrington glanced at the firing officer.

"Fire one."

At 07:57, the first Sea Slug left the launcher.

Four boosters erupted simultaneously, surrounding the missile in a brilliant cloud of flame and smoke. The launch produced a thunderous roar that rolled across the battleship's upper decks.

The missile accelerated away from the ship, climbing rapidly toward the approaching MiG.

On the bridge, Collins watched the smoke trail stretching northward.

"Missile away," Wallace confirmed.

Deep inside the operations room, the missile's progress was followed through the fire-control system.

"Guidance stable."

"Target maintaining course."

"Range closing."

The North Vietnamese pilot saw the missile too late.

He broke sharply to port, rolling his fighter into a steep descending turn. But the Sea Slug continued toward the predicted interception point, guided by the battleship's radar.

"Ten seconds."

"Five."

A brilliant flash appeared against the pale morning sky.

For a moment, the MiG seemed to vanish inside a rapidly expanding cloud.

Then burning fragments emerged, tumbling toward the sea.

"Target destroyed!" Fraser shouted.

A brief cheer erupted inside the operations room before Mercer silenced it.

"Quiet! We still have another aircraft."

On the bridge, Collins allowed himself only a short nod.

"One down. Where's the second?"

The Second MiG

The surviving fighter had reacted immediately to the destruction of its companion.

Its pilot abandoned his original approach and descended sharply, attempting to escape the battleship's radar by flying close to the sea.

"Second contact descending rapidly!" Fraser called. "Altitude five thousand feet ... three thousand ..."

The radar return became increasingly difficult to distinguish from interference near the surface.

"Range eighteen miles. Bearing zero-two-eight."

Harrington studied the tracking data.

The Sea Slug was primarily designed to engage aircraft at medium and high altitudes. A fast-moving fighter descending toward the sea presented a much more difficult target.

"Tracking quality deteriorating," the radar operator warned.

"Can we maintain guidance?"

"For the moment, yes."

Harrington contacted the bridge.

"Captain, target two is descending below our preferred engagement envelope. Recommend immediate second launch before we lose tracking."

Collins looked toward the starboard horizon.

"Approved. Engage."

The launcher had already returned to its loading position, where the next missile was being transferred from the handling system.

Inside the magazine complex, motors hummed and hydraulic machinery moved the heavy weapon into place.

"Missile two loaded."

"Guidance channel ready."

"Target range fourteen miles."

Harrington knew they had little time.

"Fire two!"

The second Sea Slug thundered away from the battleship.

The missile climbed initially, then began its guided approach toward the descending fighter.

For several seconds, everything appeared normal.

Then the radar operator spoke.

"Target turning hard starboard. Altitude eight hundred feet."

Harrington's expression tightened.

"Maintain illumination."

The MiG pilot was now flying dangerously close to the water, attempting to break the radar lock through violent manoeuvres.

The missile continued closing.

"Guidance unstable."

"Keep it on him."

"Range three miles."

The fighter began another turn, its wings banking steeply above the sea.

Then the radar display showed the two tracks converging.

"Impact imminent!"

A flash appeared just above the horizon.

A second later, the tracking signal disappeared.

"Target lost."

Nobody spoke.

Fraser studied the radar picture, searching for another return.

There was nothing.

Then the starboard lookout reported over the voice circuit.

"Explosion observed! Bearing zero-three-one! Aircraft debris falling into the sea!"

Harrington looked toward Mercer.

"Confirmed?"

Mercer waited for the reports from the American destroyers.

A few seconds later, the answer arrived.

"Both American ships confirm explosion and splash. No aircraft remaining on radar."

He lifted the handset.

"Bridge, operations. Second target destroyed. Two aircraft engaged, two aircraft down."

After the Battle

At 08:06, the air raid alarm was cancelled.

The entire engagement had lasted less than fifteen minutes from the first warning to the destruction of the second aircraft.

On the bridge, Captain Collins stood silently for a moment, looking toward the distant patch of sea where the second MiG had disappeared.

"Two missiles?" he asked.

"Two missiles, sir," Wallace replied. "Two confirmed kills."

Collins glanced toward the aft superstructure.

"Not bad for an old battleship."

The remark produced a few restrained smiles.

Within the ship, the atmosphere was more openly celebratory.

The Sea Slug crew had accomplished something many had doubted possible when the modernization programme was first proposed. A battleship launched during the Second World War had successfully defended a modern naval formation against jet aircraft using guided missiles.

For the men who had spent years maintaining the complicated weapon system, the engagement was a vindication of their work.

But Collins was already thinking about the next task.

"Signal the Americans. Inform them that the air threat has been neutralized and that we are returning to our assigned station."

"Aye, sir."

"And tell the gunnery officer I want the forward turrets ready by nine hundred. We still have a fire-support mission scheduled."

Wallace smiled.

"Very good, sir."

The Old and the New

By late morning, HMAS Australia had resumed her position off the Vietnamese coast.

The battleship turned slowly to starboard, bringing her forward gun turrets onto their assigned bearing.

Several miles inland, Australian troops had requested naval fire support against a fortified position overlooking an important supply route.

The target coordinates were passed to the ship's gunnery control centre.

"Forward turrets ready."

"Target acquired."

"Commence firing."

A moment later, the two great forward turrets erupted in flame.

The enormous concussion rolled across the decks as the 14-inch guns sent their shells arcing toward the distant coastline.

The contrast could hardly have been greater.

Only hours earlier, the ship had destroyed two jet fighters with radar-guided missiles. Now she was using guns designed in the 1930s to support soldiers fighting ashore.

It was precisely this combination that made HMAS Australia unique.

She belonged to two generations of naval warfare.

Her armoured hull, massive gun turrets and powerful machinery were products of the battleship era. Her guided missiles, electronic sensors and helicopter facilities represented the technological revolution that had transformed naval combat since 1945.

For many years, critics had argued that the battleship was obsolete.

Yet on that September morning in 1967, far from the shipyards of Britain where she had been built, the former HMS Duke of York had demonstrated that an old warship could still have a place in a modern fleet.

In the official report submitted to the Royal Australian Navy, Captain Collins concluded with a brief assessment:

"The engagement demonstrated the effectiveness of the ship's modernized air defence systems under operational conditions. Both hostile aircraft were successfully engaged and destroyed. No damage or casualties were sustained aboard Australia or the accompanying vessels."

The incident became one of the most celebrated episodes in the battleship's post-war career.

When HMAS Australia finally returned to Sydney several months later, her crew painted two small aircraft silhouettes beneath the bridge wing, commemorating the first aerial victories achieved by the ship's Sea Slug missile system.

Years later, after the battleship had been decommissioned and preserved as a museum ship, those two silhouettes remained visible.

They served as a reminder of a remarkable morning in the Gulf of Tonkin, when a veteran of the Battle of the North Cape had faced the jet age — and emerged victorious.

The old battleship had not yet fired her last shot.