John Ripley's legendary action at Dong Ha Bridge, portrayed in a diorama at the U.S. Naval Academy, required extraordinary stamina and unflinching courage in the face of continual enemy fire. (U.S. Naval Academy)

"We’ve got to blow that bridge at Dong Ha," Ripley radioed to Turley. "We’ve got to buy some time."

Je-sus Ma-ry get me there. Jesus-Mary-get-me-there. JesusMarygetmethere!” Marine Captain John Walter Ripley repeated this rhythmic chant over and over as his fingers gripped the flanges of the “I” beam under the bridge and he swung himself, hand-over-hand, toward the boxes of explosives carefully nestled in the steel girders.

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For three grueling hours, Ripley had clung to the underside of the bridge, dragging some 500 pounds of explosives along the steel beams, meticulously preparing the structure for destruction, all the while under often-intense enemy fire.

Fighting complete exhaustion, he was now willing himself through the last steps of the long operation, attaching the blasting caps and fuse cord to the explosives and then getting safely back to the riverbank in one piece. With the leading edge of a massive mechanized offensive by the North Vietnamese Army (NVA)—some 200 tanks and 20,000 troops preparing to rumble across the bridge—the very future of South Vietnam hung in the balance.

Earlier that day, as the sun rose in the sky and the overwhelming enemy juggernaut prepared to roll over the meager forces arrayed against it, Ripley was sure that he would not live to see that day’s sunset. In his own mind he was a dead man walking, on his way to certain death. As American involvement in Vietnam was winding down in March 1972, the North Vietnamese decided that the time was right to launch a final offensive, one that would end not only in a military victory but would also deliver a crushing psychological blow to the South Vietnamese and their U.S. allies.

The goal of the so-called Eastertide Offensive was to capture Saigon, and the North Vietnamese planned to reach this prize by making three separate but coordinated drives southward: through the Central Highlands, down the Ho Chi Minh Trail and down the coastline on Highway 1. It was this last invasion force, which had as its objective the ancient city of Hue—a necessary first step to the eventual capture of Saigon—that Ripley encountered at the bridge near the village of Dong Ha.

Days earlier, the North Vietnamese Army began putting pressure on South Vietnamese firebases near the demilitarized zone (DMZ). Although the assumption was that the NVA would engage these bases and then back off, South Vietnamese marines nevertheless began moving north to counter the enemy threat.

As the lone American adviser to the 3rd Vietnamese Marine Corps infantry battalion, Ripley was with the unit as it moved north to the village of Dong Ha, less than seven miles south of the demilitarized zone. Reaching Dong Ha on April 1, Ripley and the South Vietnamese marines were met with a brutal NVA artillery barrage that lasted all night.

Enemy Tanks Stretch From the Dong Ha Bridge Back to the DMZ

At daylight the next day—Easter morning—the shelling slowed and Ripley left his bunker to do a reconnaissance and check nearby craters to try to find where the enemy was shooting from. The previous day’s actions and heavy artillery onslaught had allowed him and his South Vietnamese marines little sleep or food. With craters everywhere, the area resembled the moon, yet it was familiar terrain to Ripley.

He had lived, worked and fought around Dong Ha for 12 months in 1967 as a company commander with a U.S. Marine unit. Moreover, Ripley was very familiar with the bridge spanning the Cua Viet River. He had been there when Navy Seabees built it, so he knew how the bridge was constructed, and he understood its tremendous strategic importance as the only bridge that could carry heavy tanks, self-propelled artillery and other similar military vehicles up and down Highway 1—South Vietnam’s only major north-south route.

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