On the above date, just before 0400hrs, Station 23 was alerted to assist Christiana Fire Company on a "Working" commercial building fire. Engine 235 with a crew of 6 under the command of Captain Mills quickly responded. Crews arrived to find a single story 100x30 mixed commercial occupancy building with heavy fire conditions through the roof. Engine 235 was directed by command to stretch a back up hand-line to assist with fire extinguishment. Crews worked to pull ceiling in the building to extinguish the fire. This fire went to 2 alarms before being brought under control. Engine 23 operated for around 3 hours before being released by command.