"It's a filthy dwarf!" they scream, "Kill it!!"
Goblin 1d20=9 @-4 =5 (wouldn't hit AC 9) so misses (Morgan has no free counter strike because he is not employing a lighter weapon).
Now Hiridhren arrives to attack on the flank: Hiridhren 1d20=9 @+2 (would hit AC 8) so misses.
Meanwhile, new opponents arrive via the window, to find Dorgan in their way. Dorgan has but one round this turn due to moving into contact: 1d20=8 @+2 (would hit AC 6) hits, 1d6=1, ref rolls goblin hit points (1-1 HD) 1d6-1=3, so no kill.
So we now have at least four goblins (two via the door, one via the window, and another yet clambering through the the window).
What do you intend for the upcoming third combat turn?