This article discusses Po obu stronach oceanu [On Both Sides of the Ocean], the memoirs of the Polish émigré writer Zofia Arciszewska, published in 1976 by the Polish Cultural Foundation in London. The work is a retrospective account of the author’s life, interwoven with reminiscences of other women who participated in the defence of Warsaw in 1939. Arciszewska’s memoirs are notable for their strong emphasis on female solidarity and sisterhood. Women provided one another with emotional support at times when information about the fate of their husbands and sons – who were fighting or imprisoned – was unavailable. They formed networks of informal organisations that assisted those who had been arrested, smuggled medicines, letters from abroad, and travel documents, and distributed underground leaflets. By documenting the everyday life of the capital during the first days of war and occupation, Arciszewska conveys women’s emotions: their courage as well as their fear, hope, and compassion. She assumes the role of a custodian of memory, not so much of historical events as of the attitudes and actions of Warsaw women. In this sense, her memoirs serve as a form of resistance against forgetting and indifference toward these silent heroines of the war. It is worth highlighting that this piece can be read not only as an emotional story about family, separation, war, emigration, and building a life “on both sides of the ocean,” but also as a record of historical events. The numerous dates, places, names, and institutions interwoven into the narrative create a portrait of the era. From this perspective, Arciszewska’s memoirs constitute a valuable source for research on the experiences of Polish women and men in emigration.