The Americans suffered heavy losses of 1,000 dead, hundreds taken prisoner, and the loss of most of their heavy equipment. The Germans who analyzed the captured American equipment sent back unfavorable reports on the American tanks and guns, which would entice German commanders to underestimate the Americans in the future.
For the Americans studied Kasserine Pass even more intently than the Germans. They changed leadership where in was needed, and gave junior officers the authority to make on-the-spot decisions. Major General Lloyd Fredendall, commanding II Corps, was replaced by the more aggressive General George Patton. The M3 tank was quickly replaced with the M4 Sherman, which mounted the same 75mm gun in a traversable turret. While it was never the equal of the German tanks, it was easier to maintain and traveled much further between refits.
Most importantly Kasserine Pass taught the Americans the doctrine of massed firepower. The Americans developed ways to mass artillery fire, and to coordinate aircraft with ground forces. Three days later, on February 23, massive air bombing drove Rommel back through Kasserine Pass attempting to reach his prepared positions on the Mareth Line.
Again the Americans paused. Rommel made it to his fortifications, a twenty-two-mile line built by the French against an Italian invasion of Tunisia. He reached the Mareth Line on February 25. The next day Montgomery’s Eighth Army attacked, and in a series of probing battles weakened the Axis forces. Coming into conflict with the split Axis command, Rommel clashed with General von Arnim over tactics and logistics. Rommel had lost the one battle he was never allowed to direct. Allied forces on Malta had cut his supply lines, and he was running out of food, ammunition and fuel.
On March 20, The Allies broke the Mareth line and linked on April 8, 1943. Rommel had already been flown out, too ill to continue the battle. By May 13, the day the last resistance ended, 240,000 Italian and German prisoners were rounded up.
The buildup began for the invasion of the Italian mainland. The first stop was the island of Sicily.
Years of hard fighting lay ahead for the Allies and the Axis. But all the major players were now engaged. Churchill, at the Casablanca Conference in January 1943, called North Africa “not the beginning of the end. But the end of the beginning.”