Crossing the Rubicon

Crossing the Rubicon is

a phrase connoting the passage of a point of no return. The phrase refers to Julius Caesar's invasion of Ancient Rome, when, on January 10, 49 BC, he led his army across the Rubicon river in violation of law, hence making conflict inevitable.
part of a speech by President Botha of South Africa during the 80's referring to the State of Emergency.
title of a 2004 book by Michael Ruppert on September Eleventh
title of a book by C. Raja Mohan on Indian foreign policy
title of a book by Julie Kaufman on human-animal relationships
title of a book by Nicholas Laham on Ronald Reagan's Middle East foreign policy
title of a book by Nathans Y. Yuan about a Chinese immigrant family