the trees fall interlocked pointing at a 45-degree angle towards the direction of approach of the enemy. Furthermore, it is recommended that the trees remain connected to the stumps and the length of roadway covered be at least . US military maps record an abatis by use of an inverted "V" with a short line extending from it to the right. See also Great Zasechnaya cherta Notes References External links Pamplin Historical Park & The National Museum of the Civil War Soldier includes large and authentic reproduction of abatis used in the U.S. Civil War. Fortifications by type Medieval defences