What battle marked the back stabbing break of the Non-Agression Pact by Germany?

The Battle of Stalingrad

Explanation:

It is famous for its line "Not one step back!" The Battle of Stalingrad (23 August 1942 - 2 February 1943) was a major battle on the Eastern Front of World War II in which Nazi Germany and its allies fought the Soviet Union for control of the city of Stalingrad in Southern Russia, on the eastern boundary of Europe.

latin america is a region of racial and cultural diversity.  it is a group of countries and dependencies in the americas where romance languages are predominant. the term originated in 19th century france as amérique latine to consider french-speaking territories in the americas along with the larger group of countries where spanish and portuguese languages prevailed.

explanation:

straight down to hell mate