A battle always has as its purpose the reaching of a mission goal by use of military force.[8] A victory in the battle is achieved when one of the opposing sides forces the other to abandon its mission and surrender its forces, routs the other (i.e., forces it to retreat or renders it militarily ineffective for further combat operations) or annihilates the latter, resulting in their deaths or capture. A battle may end in a Pyrrhic victory, which ultimately favors the defeated party. If no resolution is reached in a battle, it can result in a stalemate. A conflict in which one side is unwilling to reach a decision by a direct battle using conventional warfare often becomes an insurgency.