Solo-Mode
The Lonesome Road expension is an unofficial way to play Warcry all by yourself. You'll find a rule set that plays the enemy warband for you, complete with target priority, objective hunting and more!
It's totally free and you can get it here (Link)
The Bloodfane Arena is a free supplement produced by the YouTube channel Red Rose Wargaming. It pits your fighters in a dramatic battle to the death over the course a a 3 round mini-campaign.