After you enter Level 23 "The Hand Is Mightier", you move toward an open metal gate.

Suddenly, a shielded grunt Mil armed with a rivet gun comes from outside the gate. He says "What are you doing here? No droids are allowed in this area of Mil City! Prepare to be destroyed!"

When he starts speaking, run toward the back of the generator on the left side, and a shop will appear. Buy the Level 3 S.P.E.W. EUK to destroy Milbot shields.

Use the S.P.E.W. to fight this grunt as you run through the gate. Fight two more grunts as you go under the bridge.

After going under the bridge, you see a Titan. Throw an EMP grenade at him, and fire a control tether at his D port to take control of him. Then use him as your fighter against the other Mils.