OP should learn to steal the context comment from reddit, too. - https://www.reddit.com/r/HistoryMemes/comments/1wihpaw/its_just_a_small_hill_go_on_ahead_and_attack_from/

Context :- At Rivoli the Austrians devise a plan to quickly advance and relieve the seige of Mantua . They feint attacks from other sides but attack from the north which is held by French troops led by Joubert. Lusignan troops on the right side of the advance is asked to go across Monte Baldo and take Rivoli from the rear

This is a disaster because Monte Baldo is a gigantic mountain , its about 7000 ft high and going across this mountain takes him a loong time and leads to many deaths reducing the efficiency of the attack and mainly making it easier to hold Rivoli with more manageable odds

Reference to the Battle of Rivoli, part of the Siege of Mantua 1796-1797