Crothian said:
My group doesn't do anything orderly. They are choas theory in motion.

My group is almost exactly the opposite. Ordely and methodical in the extreme; although they do seem to know when the monsters are off balance and they exploit the situation. They typically maintain lines of retreat, set a rear watch (can you say familiar), etc. and have declined to enter areas where retreat may be cut off.
They have retreated, once when over pursueing and running into a rain of crossbow bolts from a dark cavern they did this immediately because, I think, they did not know the size of the cavern or the number or exact composition of the enemy. Also it being at least a dozen bolts didn't help either. Luckly the heaviest armored fighter was on point in the pursiut and his armor saved him.
Once they effectively retreated to heal and regroup, while the monsters did the same (about 7 goblins and 1 hobgoblin regrouped with their 12 hobgoblin and 24 goblin buddy reinforcements) this after the party slew about 17 goblins and 7 hobgolins. This was a tough call for them as they didn't know how fast the goblins could or would regroup, lucky for them the goblins were in even greater disarray with no strong leader (they got him with a good spear cast). All pretty good for 6 about 2nd level PCs and one 1st level NPC. Of course through superior scouting and parley/"alliance" with other dungeon inhabitants they were able to achieve surprise on the goblin hordes and execute a two prong attack, a frontal "attack" to distract combined with a major flank attack.
Added: Seeing the above maybe this is experienced play maybe not. Certainly those in our have all been at it for near 30 years each (only about a year in the current campaign), but I recall using similar cautious tactics (scouting, open retreat, rear watch, setting traps, etc.) in junior high school (now over 25 years ago). Taking the risk of sounding too grognardy

maybe it was war games, and in particular Squad Leader, that schooled us in caution. As a die-hard Russian player one learns the dangers of rushing into unknown or prepared positions across the dread "open ground."
