Prologue - Troubled Past | Act I Gears of War 3 Guide
Last update: 11 May 2016
Afterward you leave the cell turn right, destroy the steel doors and pick up the Cog Tag #1, which is on the floor.
Then leave the room and start running toward to the girl, who is waiting at the end of corridor.
When you get outside go straight on and pass one of many self-creates gates.
When you passed it run to the wall, cover behind it (press A button) and start shooting at the enemies standing in the bottom. In certain moment the enormous corpser and some opponents with rocket launchers will show up on the battlefield. Take out the rocket enemies and after few moments the mission will end.