Big wall climbing is a type of rock climbing where a climber ascends a long multi-pitch route, normally requiring more than a single day to complete the climb. Big wall routes require the climbing team to live on the route often using portaledges and hauling equipment. It is practiced on tall or more vertical faces with few ledges and small cracks.
In the early 20th century, climbers were scaling big rock faces in the Dolomites and the European Alps employing free- and aid- climbing tactics to create bold ascents. Yet, the sheer walls were waiting to be climbed by future generation with better tools and methods.
In addition many nations in the early 1900s had specialized army units that had developed wall climbing skills for gaining surprise entry into enemy fortifications by wall climbing. In the early 1900s the 'Filipino Scouts', an US Army unit composed of Filipino enlisted and American officers, demonstrated their specialized skills by climbing the steep walls of a Spanish era fortification in Manilla, then bested that demonstration by climbing the same wall again only bringing a battery of mountain howitzers this time to the top of the wall.