The Tunisia campaign of WW2 is a pretty interesting one, and a classic case of throwing good money after bad. The Axis could barely resupply North Africa as it was, and the British had been sinking a huge percentage of Axis shipments from their air and naval base on Malta since early 1941. The Axis should have seen the writing on the wall after El Alamein, and withdrawn from North Africa completely to the extent they could. Instead, they shipped even more men and equipment to Tunisia, only to eventually have the entire bundle end up in POW camps, 230,000 men in all. Really stupid. They could have cost us a lot of blood and trouble later in the War, as these were really good and well trained troops, including almost the entire Afrika Korps.
Tunisia was also the first time U.S. forces came into contact with the Germans in the European theater, and we didn't exactly cover ourselves with glory, enough so that the Germans underestimated our Army going forward. Teething pains and inexperience, mostly. At this stage (Early 1943) the British still had to do most of the heavy lifting.
Tunisia for the Axis is a perfect example of the old saying that stubbornness is a weak and stupid man's imitation of resolve.