In the last mission of Sniper Elite 3, You find Yourself at the Ratte Factory.

1st Objective : Destroy the two Generators
2nd Objective : Plant bombs on the Pillars and Ratte (Tank),
3rd Objective : Find a Suitable Sniping position and Extraction point.
4th Objective : Take the Shot and Destroy the Charge (shown in Video)

After this cinematic starts and the Ratte and Factory itself is destroyed and Vahlen is also shot by you.