Assigned to the
Potomac Flotilla, she began her active service by blockading the
Virginia side of the
Potomac River. From 29 May to 1 June 1861, she joined in attacks against
Confederate positions at
Aquia Creek, Virginia. On 20 June she engaged Rebel batteries at
Marlborough Point, Virginia; and a week later she fought Confederate forces at
Mathias Point, Virginia.
Reliance patrolled the river, searching for smuggled supplies, runaway slaves, and deserting Confederate soldiers. On 12 August 1862, she captured the
sloop,
Blossom, and sent a boat expedition into
Sturgeon Creek. She seized the sloop
Painter off
Alexandria, Virginia, 30 October and took the longboat,
New Moon, on 24 November carrying
contraband cargo. ==
Reliance is captured by Confederate raiders ==