Another confusing paragraph was the initial count off of the Ork defenders at the refinery. (emphasis mine)
"There are eight Ork Slugga Boys (see page 239) led by a Nob (see page 239) and five Gretchin led by a Runtherd (see page 240) defending the facility. One Ork is assigned to each of the nine watchtowers at all times. The remaining twenty-one Slugga Boys…The Nob rests in the Living Quarters at night and bosses around on the remaining Orks during the day time."
How do we get (8 boys + 1 nob + 5 Grots + Runtherd) - 9 Boys (in towers) = 21 Boys
By the initial count there is actually -1 boys in the towers….
Should it perhaps be….
"There are thirty Ork Slugga Boys (see page 239) led by…"