Speaking of first due, consider this:
From "History of Chicago Fire Houses" by Ken Little and John McNalis
Response of Engine Company 20, 1320 W. Concord Place (noted to have a small still district in an industrial area)
July 9, 1944 @ 1845 hrs. Still, then Box 465 plus 5-11 plus 3 Specials 1737 N. Bosworth Ave in a furniture factory
Sept. 3, 1944 @ 0440 hrs. Box 395, then 5-11, 1600 N. Elston Ave. in a coal yard
Sept. 4, 1944 @ 0408 hrs. Still, then Box 395 plus 5-11, 1656 N. Besley Ct. in a factory
Dec, 21, 1944 @ 0309 hrs. Still, then Box 394 plus 5-11 plus 2 Specials, 1642 N. Besley Ct. in a factory
April 11, 1945 @ 1249 hrs. Box 464 plus 5-11, 1800 N. Ashland Ave. in a lumbar yard
During the War...sabotage?