It is often said that the art of strategies defines the goals to achieve in a military campaign, while tactics defines the methods to achieve these goals. Strategic goals could be "We want to conquer area X", or "We want to stop country Y's expansion in world trade in commodity Z"; while tactical decisions range from a general statement—e.g., "We're going to do this by a naval invasion of the North of country X", "We're going to blockade the ports of country Y", to a more specific "C Platoon will attack while D platoon provides fire cover".