Abstract A collection of approximately 75 postcards and handmade cards sent from schoolchildren in Poland to Lucjan Krause (1928-2022), a member of the Polish underground resistance who fought in the Warsaw Uprising (1944). The cards, mostly written by Polish schoolchildren in 2018, express gratitude for Krause's wartime sacrifice and heroism. The cards in this collection were designed and delivered as part of a Polish campaign--"BohaterON"--to commemorate and honor the participants of the Warsaw...