In January 1943, America's President Roosevelt and Britain's Winston Churchill held a conference in Casablanca, Morocco. Russia's Stalin declined to attend (citing the fighting at Stalingrad). One "real" reason may be that there was no totally safe, clear, path from Moscow to Morocco. (Stalin attended a later conference in Tehran, Iran, in November 1943, with the two others, at a place and time that was probably safer than Casablanca in January, 1943.)
This was at a time when there was a German army (and air force) at large in Tunisia, and German submarines were operating through most of the Atlantic Ocean (although their level of activity around North Africa was unexpectedly low). In February, 1943, the Germans under Rommel launched a counterattack through Kasesrine Pass, which, had it succeeded, might have driven the Anglo-American armies back across Algeria, toward Morocco.
Was it possible, under the circumstances, for the Allied armies, fleet and air force to "guarantee" the safety of the two world leaders? Or did Roosevelt and Churchill deliberately hold a conference in a "dangerous" place to (quite literally) "rally the troops?"