Maximum firing rate for field pieces in the early days was eight rounds an hour. It increased later to 100 rounds a day for light guns and 30 for heavy pieces. (Modern non-automatic guns can fire 15 rounds per minute.) After about 40 rounds the gun became so hot it was unsafe to load, whereupon it was "refreshed" with an hour's rest. [Illustration: Figure 48--LOADING A CANNON. Muzzle-loading smoothbore cannon were used for almost 700 years.] Approved aiming procedure was to make the first shot surely short, in order to have a measurement of the error. The second shot would be at greater elevation, but also cautiously short. After the third round, the gunner could hope to get hits. Beginners were cautioned against the desire to hit the target at the first shot, for, said a celebrated artillerist, "... you will get overs and cannot estimate how much over." As gunners gradually became professional soldiers, gun drills took on a more military aspect, as these seventeenth century commands show: 1. Put back your piece. 2. Order your piece to load. 3. Search your piece. 4. Sponge your piece. 5. Fill your ladle. 6. Put in your powder. 7. Empty your ladle. 8. Put up your powder. 9. Thrust home your wad. 10. Regard your shot. 11. Put home your shot gently. 12. Thrust home your wad with three strokes. 13. Gauge your piece. Gunners had no trouble finding work, as is singularly illustrated by the case of Andrew Ransom, a stray Englishman captured near St. Augustine in the late 1600's. He was condemned to death. The executional device failed, however, and the padres in attendance took it as an act of God and led Ransom to sanctuary at the friary. Meanwhile, the Spanish governor learned this man was an artillerist and a maker of "artificial fires." The governor offered to "protect" him if he would live at the Castillo and put his talents to use. Ransom did. [Illustration: Figure 49--A SIEGE BOMBARD OF THE 1500's.] By 1800, although guns could be served with as few as three men, efficient drill usually called for a much larger force. The smallest crew listed in the United States Navy manual of 1866 was seven: first and second gun captains, two loaders, two spongers, and a "powder monkey" (powder boy). An 11-inch pivot-gun on its revolving carriage was served by 24 crewmen and a powderman. In the field, transportation for a 24-pounder siege gun took 10 horses and 5 drivers. Twelve rounds an hour was good practice for heavy guns during the Civil War period, although the figure could be upped to 20 rounds. By this date, of course, although the principles of muzzle loading had not changed, actual loading of the gun was greatly simplified by using fixed and semi-fixed ammunition. Loading technique varied with the gun, but the following summary of drill from the United States _Heavy Ordnance Manual_ of 1861 gives a fair idea of how the crew handled a siege gun: