In this task, you're given a question, along with a context passage which has extra information available on certain terms mentioned in it. Your job is to determine which sentence(s) from the passage can be used to search for further information needed to answer the question.

Question: What side was the Austro-Hungarian army on? Passage:Antoni Chrusciel was born on 16 July 1895 in the village of Gniewczyna ancucka halfway between ancut and Przeworsk, to Andrzej Chrusciel, a local farmer and the vogt of that village. In 1909, while still a student at a local gymnasium in Jarosaw, Chrusciel joined the secret scouting troop; he was also active in the Zarzewie movement. In 1914, after the outbreak of the First World War he moved to Lwow, where he joined the Eastern Legion. Soon afterwards, as a citizen of Austria-Hungary, he was drafted into the Austro-Hungarian Army. After graduating from an NCO school in May 1915 he served at various posts, including his service as a commanding officer of a company of the 90th Infantry Regiment. After the dissolution of Austria-Hungary and the chaos at the eastern front, Chrusciel's regiment was the only unit in the entire Austro-Hungarian Army to return to the barracks as an organized entity and with arms. Few weeks later Chrusciel, together with most of his unit, joined the newly formed Polish Army.
Soon afterwards, as a citizen of Austria-Hungary, he was drafted into the Austro-Hungarian Army