Moltke's main thesis was that military strategy had to be understood as a system of options since only the beginning of a military operation was plannable. As a result, he considered the main task of military leaders to consist in the extensive preparation of all possible outcomes. His thesis can be summed up by two statements, one famous and one less so, translated into English as "No plan of operations extends with certainty beyond the first encounter with the enemy's main strength" (no plan survives contact with the enemy). and "Strategy is a system of expedients".