Just today! It really was random chance- aka the dice.
Poor initiative rolls put half the party last in line after a large group of orcs, and an ogre- whose rolls put THEM in initiative order 3, 4, and 5. Worse, that half of the party was the FRONT half, and blocking the cave entrance. Thus all the monsters concentrated their attacks on them. The orcs rolled well. The fighter and cleric rolled poorly on their damage rolls, hurting, but not dropping anyone.
This left the rogue and wizard to hopefully save the day.
They did their best, but 7 orcs and an ogre is a lot of attack rolls... The Fighter dropped in round 2, and it cascaded from there. They nearly pulled it off, but ran out of HP, before the orcs ran out of attacks.
Imo, it was a very low attack roll on a Melfs acid arrow, that kept the ogre in the fight- which kept the orcs from fleeing. Ultimately leading to my Wizard getting KO'd after the rest of the party was dropped.