4 engravings, military theme

i. FERAUD (XX) World War I, Trenches in Souchez, 1916 signed, titled, and dated ‘Tranchées de Souchez / 30-1-1916 / Feraud’ (lower right) ink on paper 31 x 20 cm ii-iii. CHARLES FOUQUERAY (1869-1956) Russian Army, from ‘La guerre documentée’ 32 x 24,5 cm; 32 x 24,5 cm Published by Librarie Schwarz et Cie, Paris iv. XX CENTURY Serbian soldiers signed with initials in plate ‘G.B.B’ (lower left) engraving 24,5 x 29 cm