Genoway was acquired in a trade with the Minnesota Wild in exchange for a conditional seventh-round pick in the 2014 NHL Draft. Genoway, 26, has four goals, 19 points and a plus-11 rating in 53 games with Minnesota's American Hockey League affiliate in Houston.
He made one NHL appearance for the Wild and notched an assist on April 7, 2012, against the Phoenix Coyotes. According to the Capitals, Genoway will report to the AHL's Hershey Bears.
The 5-foot-9, 177-pound Genoway was signed by Minnesota as an undrafted free agent on April 12, 2011. He posted 26 goals and 127 points in 168 career games with the University of North Dakota, helping the team advance to the 2011 Frozen Four.
Deschamps, a 2008 second-round pick (No. 35) of the Anaheim Ducks, had seven goals and 16 points in 49 games with the AHL's Toronto Marlies this season. Marshall, a 2007 second-round pick (No. 41) of the Philadelphia Flyers, had one goal and four points in 52 games for the AHL's Hershey Bears.