What is an enfilade?

In military terminology, the French term enfilade implies that an enemy formation should be fired upon at it longest axis. A column should be fired on from the front or rear. A rank should be attacked from the flank. The rationale is that a maximum number of rounds fired will find a target in this configuration. This always works when using mass fire techniques. The naval equivalent is the "magical crossing the T". Precision weapons are not dependent on this tactic. (But precision is a relative term, and despite what you may see on television, bombs, bullets and rockets all have a margin of error).