To muster his host and bring it into danger:–this may be termed the business of the general.
In summary, this is what a leader does, choosing direction and motivating others to follow.
In war, mustering is a combination of organizing and motivating, of giving purpose and creating readiness, even anxiety for fighting. When soldiers are sufficiently motivated they will face danger with a will.
In business, whilst the danger is not mortal, it can still kill the company, leading its people to lose their livelihoods. As such it is still a very serious affair.