What battle was the first sea-born assault against a coral atoll?

The first sea-born assault against a coral atoll was indeed at Tarawa. This battle, which took place in November 1943, marked a significant moment in the Pacific Theater during World War II. The objective was to capture the heavily fortified Japanese-held atoll of Betio in the Tarawa Atoll, which was a strategic point for launching further attacks in the central Pacific.

The assault was notable not only for its strategic importance but also for the innovative amphibious tactics employed by the U.S. Marine Corps. Unlike previous engagements, Tarawa presented unique challenges due to its coral reef environment, which affected landing operations. The shallow beaches and the hard coral made it difficult for landing crafts to reach the shore, resulting in higher casualty rates and significant adjustments to naval and land assault tactics.

This battle set a precedent for later amphibious operations, showcasing the need for comprehensive planning and execution in similar environments. Understanding Tarawa's significance, including its role in refining military strategies for coral atoll assaults, is crucial for comprehending the evolution of warfare in the Pacific during World War II.