Supported at start of combat, but unsupported at the end?

[toco]

After a couple of plays I have a question about supporting units.

An unit Empire Halberdeers (with joined Hero) is in combat with one unit of Orcs. This unit of Orcs has a unit of Goblins behind it as support. (So in effect, 3 rows Orcs followed by 3 rows Goblins.)

Now if the Halberdeers inflict enough hits to remove one stand, should I remove one stand of Orcs or one stand of Goblins?
I think it would be one stand of Orcs. Do I remove the back row? Then there's a gap between the Orc unit and Goblin unit. So this would mean the Goblins don't provide support anymore?
I can't remove the front row according to the rulebook.

[Dave]

You only remove stands from units in combat, so the orcs. That means you have ine less support. However in WM Rev you count support before stand removal.