In Germany, shortly after WW1 (first idea 1919, first held 1922) the Volkstrauertag (people's mourning day) was introduced to remember the military dead and was held at the sunday Reminiscere (remember) of the Church year (5 weeks before Easter sunday).

The Nazis renamed it Heldengedenktag (remembrance of heroes day) and ordered that the flags on this day had to fly high instead of half mast.

The day was of course renamed Volkstrauertag immediately after WWII and relocated to the 33rd Sunday of the church year (Catholic counting) or the second before last Sunday of the Church year (Protestant counting). Both countings of course point to the same Sunday in November, namely two weeks before the first Advent. It may coincide with 11/11, but usually is held on the Sunday following armistice.

Wolfgang