Have able-bodied people move the dead out of the way, and preferably out of sight. Designate an assistant to move the walking wounded to another location.
If possible, assign someone to stay with those who are likely to die within a short time. Get them to a quiet area. Find somebody who is mature, but who may not be physically very strong, to stay with these folks and comfort them during their last minutes or hours.
Execute
Have a group of worker bees search for heavy extremity bleeding and apply pressure dressings or tourniquets. Instruct them to use any available materials, including belts, shirts, and bras.
Finally, don't forget to continually reevaluate the situation. This may include retriaging the injured as their situations change.