As Allied Forces made their way through Europe, liberating Nazi-occupied territories, Monuments Men were present in very small numbers at the front lines. Lacking handbooks, resources, or supervision, this initial handful of officers relied on their museum training and overall resourcefulness to perform their tasks. There was no established precedent for what they confronted. They worked in the field under the Operations Branch of SHAEF (Supreme Headquarters Allied Expeditionary Force, Europe, commanded by Eisenhower), and were actively involved in battle preparations. In preparing to take Florence, which was used by the Nazis as a supply distribution center due to its central location in Italy, Allied troops relied on aerial photographs provided by the MFAA which were marked with monuments of cultural importance so that pilots could avoid damaging such sites during bombings.