Fort Clinton's garrison of 300 soldiers was smaller than Fort Montgomery's, but it was built on higher ground, and its defenses were more complete. It was commanded by General James Clinton, for whom it was named[2] (and not his brother, General George Clinton, or Sir Henry Clinton, the British Commander-in-Chief in North America and opposing general in the struggle over control of the strategically critical river).
On October 6, 1777, Forts Clinton and Montgomery were attacked by the British 63rd Regiment led by Sir Henry Clinton (a distant relative of James Clinton, according to information at the Fort Montgomery state historic site museum). The Battle of Forts Clinton and Montgomery was intense but brief, with both forts being overrun within an hour and the wounded General James Clinton retreating with his men through Popolopen Gorge.[3] The forts were razed by the British, and the iron chain they sought to defend was dismantled. The Rebels installed another Hudson River Chain farther upriver.