This task is about writing a correct answer for the reading comprehension task. Based on the information provided in a given passage, you should identify the shortest continuous text span from the passage that serves as an answer to the given question. Avoid answers that are incorrect or provides incomplete justification for the question.

Passage: With the growing possibility of an Allied invasion in the Balkans, the Axis began to divert more resources to the destruction of the Partisans main force and its high command. This meant, among other things, a concerted German effort to capture Josip Broz Tito personally. On 25 May 1944, he managed to evade the Germans after the Raid on Drvar (Operation Rosselsprung), an airborne assault outside his Drvar headquarters in Bosnia. Question: What type of assault was there in Bosnia?
airborne