The phrase spoken by Mark Anthony in Act 3, Scene 1, line 273 of William Shakespeare's Julius Caesar was "Cry 'Havoc!', and let slip the dogs of war". This is a line smartly uttered by Anthony shortly after Caesar is assassinated.

What was Anthony saying? Critics and experts tell us that “cry havoc” is understood and used to express an emotion about what is surely and shortly to come. One is to “cry” out in such a way that it expresses fortitude and courage. The “havoc” which will occur is to be a reminder that there is much to be gained with an upcoming struggle. This is seen as a very motivating phrase when it is used in the right moment.

“Let slip the dogs of war,” could have many different meanings depending on who utters it and who hears it. Are they bloodthirsty beasts, money hungry mercenaries, or well trained soldiers fighting for a cause that they truly believe? Either way in this instance with Mark Anthony, it is a highly motivational speech from a highly revered leader.

More Info: en.wikipedia.org