A short Boko Harem video (90 seconds) which features HMG / light cannon on trucks / jeeps and at least one 105mm Anglo-Italian pack howitzer in action, which I assume has been captured from the Nigerian Army (which has them):http://sendvid.com/xjne3w98

Wiki on the gun:http://en.wikipedia.org/wiki/OTO_Melara_Mod_56 and a short film showing how it is a pack:http://www.liveleak.com/view?i=867_1296317636