Joel Cook, correspondent of the Philadelphia Press: “Another type of order, always implying light marching-order, was sometimes made. This was ‘to be held in readiness to march at five minutes’ notice.’ Such an order as this was given when an engagement was in progress or anticipated, and the soldiers stood in line behind their musket-stacks until the order was rescinded or they were marched off in accordance with it.” -- from Cook’s The Siege of Richmond, as quoted in Henry Steele Commager’s The Blue and the Gray, volume 1, page 289