Take the following as truth: They trotted out numerous theories to establish the Kosovo mission's  Air power alone had never won a war, the Serbs had proven their invincibility against Hitler, and negotiation backed by gradual military escalation had failed in Vietnam.
Then the following statement: "According to them the Serbs had proved themselves invincible in the face of Hitler's forces." is true, false, or inconclusive?
Answer: True