The Blockade of Phalsburg by Erckmann-Chatrian

The next morning, at daybreak, between six and seven o'clock, when we were all asleep, the report of a cannon made our windows rattle. The enemy usually fired only at night. I listened; a second report followed after a few seconds, then another, then others, one by one.

I rose, opened a window, and looked out. The sun was rising behind the arsenal. Not a soul was in the street; but, as one report came after another, doors and windows were opened; men in their shirts leaned out, listening.