Our publishing house considers it its duty to remind the Russian foreign countries of one of the heroic episodes of the continuation of the White Struggle - and its participants who fought in the Spanish war for the freedom and independence of Spain. One of the participants in this war, A.P. Yaremchuk, gave us his diary, written during the war in Spain. Having decided to print it, we nevertheless decided to supplement the diary with testimonies of comrades-in-arms and asked the editor of the "Sentry" V.V. Orekhov, who took the closest part in the formation of the Russian Detachment and the founding of the first Russian radio programs in Spain... V. Orekhov sent us excerpts from letters "from the battlefields" of other white officers who we consider it our duty to place... - (From preface)