From "Dieppe", a CBC miniseries directed by John N. Smith, copyright Canadian Broadcasting Corporation 1993 (excerpted for fair use only)

In August 1942, a force of 5000 Canadians, along with some British and US troops, launched a night-time raid at the German-occupied port of Dieppe in France. The raid was a total disaster, with almost 60% of the attackers killed, wounded or captured. The Dieppe fiasco was used to argue against an Anglo-American landing in Europe until 1944, letting the Soviet Union bear the brunt of the fighting against Nazi Germany.
At this time, the Royal Yugoslav Army was fighting in the Balkans, fulfilling British pleas to sabotage German supplies to North Africa, even as Germans executed tens of thousands of civilians in reprisal. By 1943, when they were no longer of use to London, the Yugoslavs were betrayed by the same British that Eisenhower accused of cowardliness, for "not killing enough Germans", and abandoned in favor of the pro-British Communist movement of Tito.