I grabbed a few decent pictures from some PDF scans of old White Dwarf magazines during the 90's. I will upload more as I stumble upon them.
Orks in Mega Armour combat Karandras and his Striking Scorpion Aspect Warriors
Catachans and a Leman Russ Battle Tank encounter Ghazhkull Thraka and his Ork horde.
Ultramarines allied with Imperial Guard for a battle report.
A Thraka-led large Ork force for a White Dwarf battle report.
Ultramarines defend a bunker from vicious Tyranids.
An Ultramarine Dreadnought faces off with its Ork counterpart.
Ultramarine Terminators engage Tyranids and a vicious Screamer Killer.
Ultramarine Terminators and Imperial Guard forces run into the Orks.
Ultramarine Assault Marines defend a landing pad against the Ork menace.