The Spaniards were strongly intrenched upon the outskirts of Santiago, and as it was a rough, hilly country, with many shallow streams and much jungle, it was hard for the American army to advance. It was General Shafter's idea to form a grand semicircle around Santiago, starting from El Caney on the north, and running in an irregular line to Aguadores on the south. Throughout this territory the Spaniards had done everything possible to hinder the advance of our troops. Barbed wire was strung in many directions, and often the brushwood would conceal dangerous pitfalls, so that any advance had to be made with great caution.