Island Near North Korea Braces for Peace

Two Miles from North Korea, Islanders Brace for an Uneasy Peace

Marines and residents at site of deadly attack remain wary as pact takes effect along border

YEONPYEONG ISLAND, South Korea—For decades, this speck of South Korea-controlled territory, which sits 2 miles from North Korean soil in waters claimed by Pyongyang, has been a flashpoint.

But the island now embodies hopes of rebuilding trust between the two sides, following an agreement to formally end military hostilities along the demilitarized zone separating the two Koreas.

North...