From August 1916, the Treaty of Bucharest formalized Romania's alliance with the Entente. This interrupted Herz's work for the musical theater. By October, "a major newspaper from the Capital" employed him to write a reportage on the planned execution of draft evaders at Craiova. While there, he befriended Radu Demetrescu-Gyr, an eleven-years-old aspiring poet, teaching him about meter and encouraging him to write more. Herz returned to his activities in Bucharest, even after its occupation by the Central Powers. In June 1917, he met Lilly Tănăsescu, and married her in July. An operetta performer based in Craiova, she was the daughter of noted actor Ion Tănăsescu. She continued to act in shows at Gabrielescu's theater until the birth of their first child, daughter Alexandra Maria. Eftimiu reports that Herz felt grateful toward Lilly, who had stood by him "in times of need", and fell for her instead of prospecting "the rich bourgeoisie of Bucharest". As reported by Massoff, Herz radically changed his philandering ways and "turned bourgeois", spending much time with his family and especially his two "adored" boys, Nonu and Kuki.