The Battle of the Nile

Bona part formed his divisions into rectangular formations, somewhat imprecisely dubbed divisional squares. These rectangles were six men deep and hollow at the centre, which is where all the baggage and supplies and senior officers went. Artillery was then positioned at each corner, and everyone was told to hold their ground and fire at the charging cavalry as soon as they came into range. As it turned out, the divisional square was virtually impregnable. By the end of the napoleonic wars, everyone would be using divisional squares too.