Fighting occurred sporadically in the state from September 1861, when Union Major General Ambrose Burnside set about capturing key ports and cities, notably Roanoke Island and New Bern. In 1864, the Confederates assumed the offensive, temporarily reconquering Plymouth, while the Union Army launched several attempts to seize Fort Fisher. The last remaining major Confederate army, under Joseph E. Johnston, surrendered at Bennett Place, near Durham, to William Tecumseh Sherman in April 1865. Troops from North Carolina played major roles in dozens of battles in other states, including Gettysburg, where Tar Heels were prominent in Pickett's Charge.