"The GOD of the Hebrews is a poor general. HE allows them no line of retreat!" - - as spoken by Yul Brynner in the rule of Rameses in the Cecil B. DeMille version of the "Ten Commandments"
That prudent and wise military commander at all times taking into consideration and determining a line of retreat during military operations if and when a movement to the rear is necessitated? As extracted from the Spartacus web site the American Civil War general officer Mc Clellan seen as dilatory and hesitant to a fault:
"Soon after this appointment Abraham Lincoln ordered McClellan to appear before a committee investigating the way the war was being fought. On 15th January, 1862, McClellan had to face the hostile questioning of Benjamin Wade and Zachariah Chandler. Wade asked McClellan why he was refusing to attack the Confederate Army. He replied that he had to prepare the proper routes of retreat. Chandler then said: 'General McClellan, if I understand you correctly, before you strike at the rebels you want to be sure of plenty of room so that you can run in case they strike back.' Wade added 'Or in case you get scared'. After McClellan left the room, Wade and Chandler came to the conclusion that McClellan was guilty of 'infernal, unmitigated cowardice'".
NOT so much cowardice and cowardly behavior as TIMIDITY? Prudent perhaps to a fault?
Timid as used to describe comportment being understood as non-aggressiveness and unassertive! NOT cowardice but a lack of gumption and positive resolve?
That word TIMID exceptionally pejorative when used to describe the behavior of a military man. That combat commander not confident of his command or his abilities. Especially when on the offensive that leader lacking in cran [guts], elan' [spirited action] or confidence seen as not being worthy of command?
From an exchange with an American professional military man who has considerable combat experience:
"Now that you mention it, we never had a line of retreat prepared as an option when I went to Command and General Staff School [C&GS] during battle planning exercises. We had alternative attacks at times when we wondered if the primary attack might be 'iffy' or we didn't know where some of the enemy's strengths were in the war games, so we had to consider other plans as the attack developed. But I don't recall ever planning a line of retreat 'just in case'. Which means probably no US Army professional school taught it."
Prudent commanders however perhaps wise taking into account a line of retreat during offensive operations if and when the situation necessitates? Such a military leader was O.P Smith from sixty-two years ago yesterday [28 November] when the American Tenth Corps in Korea  encountered for the first time the massed formations of Chinese Communist Forces [CCF].
Smith while in command of the First Marine Division moving north on the west side of the Chosin reservoir having detailed with foresight a reinforced infantry company to safeguard his main supply route [MSR] and line of retreat. Fox Company occupying and defending with great resolve dominant terrain against all comers and in the course of events doing so quite successfully! Smith PRUDENT and not TIMID!