Battle Of The Alps 1940

S1, E3: June 1940, in Southeastern France, a handful of French soldiers faced off against an invasion of 300,000 Italian troops. Elsewhere, the French army was in disarray. The Government fled to Bordeaux. The Germans entered Paris. The roads were crowded with refugees and retreating soldiers. Why did this handful of French soldiers continue to fight when all was lost? What explains their heroic victory?