The tactical box assignment was struck for 51st & Chester for the dwelling fire. It was upgraded to a full box due to numerous calls. B/C-7 placed all hands in svc for heavy fire 1st floor of a 2 story mor dwelling. Fire had extended along the front porches to both the "B" & "D" exposures. Companies had numerous handlines in svc. Ladder & S.O.C. companies had several saws in svc opening up for the extension.