The insurgents were organized into three major groups and intended to surround and attack the armory simultaneously. Shays had one group east of Springfield near Palmer. Luke Day had a second force across the Connecticut River in West Springfield. A third force force under Eli Parsons was situated to the north at Chicopee. The rebels originally had planned their assault for January 25. At the last moment, Day changed this date and sent a message to Shays indicating that he would not be ready to attack until the 26th. Day's message was intercepted by Shepard's men. As such, the militias of Shays and Parsons approached the armory on the 25th not knowing that they would have no support from the west. Instead, they found Shepard's militia waiting for them. Shepard first ordered warning shots fired over the heads of Shays' men. He then ordered two cannons to fire grape shot. Four Shaysites were killed and 20 wounded. There was no musket fire from either side. The rebel advance collapsed with most of the rebel forces fleeing north. Both Shays' men and Day's men eventually regrouped at Amherst, Massachusetts.