Chief 25, Hayden spotted the header for this fire a few blocks out.Ardmore had been disp to 1029 Countyline rd for the bldg fire, but was redirected to this fire. 25-5 requested the next alarm and an air unit to respond for heavy fire in the rear of a 2 story mor dwelling. two 5" supply lines were dropped with numerous handlines in svc on an aggressive interior attack. The bulk of the fire was knocked within the first 20 minute mark. There was extension into the "B" exposure.