Eleven For One

Eleven for One is a Western who done it?
Ivory takes the Bathsheba dray into town for fresh supplies and returns back out to the ranch a few days later with the news that their close friend, the sheriff has been died.
The eleven Bathsheba ranch hands ride into town to avenge the death of the sheriff who was once one of their own.
The posse chases the adventure and the humble reward that has been set at a measly $1,000 for the unknown killer or killers.
Their numbers soon start to dwindle down from the original eleven...
But who is doing all the killing?