New Delhi, Oct. 4 -- Israel ends one flotilla at sea-but the fight over Gaza's maritime gate is already restarting.

ASHDOD, Israel-The last boat in a weeks-long civilian convoy to Gaza, an aging trawler renamed Marinette, was seized at sea before dawn on Friday, capping an Israeli naval operation that organizers call an unlawful high-seas interdiction and Israeli officials defend as the enforcement of a wartime blockade. The capture completed a methodical sweep against what activists branded the "Global Sumud Flotilla," a patchwork armada that set out from European ports in late summer to deliver aid and force a legal and political argument into open water.

By midmorning, Israeli authorities said the passengers and crew were being proce...