January 31-Crack the Sky, Shake the Earth

Answer:

Pic 1-Year of monkey(Chinease new year on jan 31,1968)
Pic 2-Flag of Vietcong(North vietnam)
Pic 3-General William C. Westmoreland

Crack the sky,Shake the earth-Message give to communist forces

Event-'Tet offensive' which happened on January 31,2009.