By Thomas Escritt THE HAGUE (Reuters) - Congolese warlord Germain Katanga was convicted on Friday of being an accessory to war crimes including murder and pillage - only the second conviction in the 12-year history of the International Criminal Court in The Hague. The judgment, albeit by a split verdict after a six-year trial, brings some relief to prosecutors who have faced growing criticism, notably for at least five cases that collapsed either pre-trial or pre-verdict because of a lack of evidence. Two of the three judges found that Katanga had made a significant contribution to a February 2003 attack on the village of Bogoro, in a diamond-rich region of northeast Congo, by procuring guns to speed the massacre by ethnic Lendu and Ngiti fighters of some 200 ethnic Hema civilians. "Absent that supply of weapons ... commanders would not have been able to carry out the attack with such efficiency." Katanga was, however, acquitted of charges of rape and using child soldiers, and can appeal against his conviction.