Infantry definition in H&H medieval fantasy

[palewarrior]

Hello just a quick question, in the rules it states that Infantry can move backwards and even disengage from combat. So which troops are classed as "infantry" ?
Using my Orcs as an example, my Orc spears I guess are infantry but what about archers, Mountain orcs & trolls ?
Apologies if this is in the rules somewhere.

[Paul K]

Hi Palewarrior,
RE: Page 12 moving backwards or sideways. "In a hand-to-hand combat situation only A and B class infantry can move backwards."
"Infantry" in my opinion should only mean 'human' infantry. Any orcs, rats, trolls etc. regardless of their class would be therefore be excluded.