Fire showing from a two single family dwelling. Around 04:38 AM units from Ashburn were dispatched to Company 1’a area for a reported house fire. Units from Leesburg marked on the scene with fire showing from a two single family dwelling. Reserve engine 6 was dispatched as second due engine but due to Leesburg dumping the house Engine 6 arrived fourth due and assumed RIT duties. As units were making a knock on the fire tower ladder 6 was requested due to a unit getting out understaffed, command also requested 2 additional engine companies to assist. As tower 6 was hooking ceiling on the first floor and engine 23 was operating in the basement communications advised of another fire in Leesburg, with station transfers just starting to get dispatched communications asked if any units could be released. Command released wagon 5 at first then released Reserve engine 6 as a column of smoke was seen from the command post. First arriving units marked on scene at Seaton ct with a single family house fully involved with exposures. Reserve engine 6 and engine 6 operated for about an hour before returning to service.