I have read several accounts on this forum of indirect machine gun being employed - firing a machine gun at a target that it did not have a direct line of sight to. I have no doubt that this could be done, and that troops could be trained to do this. But how effective was this technique in actual combat? I mean, did it really cause a significant amount of casualties, deny the enemy a location, or keep units pinned down for significant lengths of time? I don't recall reading any accounts that described being under indirect machine gun fire. I wonder if anyone could direct me to such an account in a book or other publication. Was the average machine gunner / crew really capable of performing this? I would think the calculations would be mathematically complex; involving velocity, ballistic coefficients of the projectiles, distance, wind speed / direction, gravity, etc. I kind of get the feeling that this might look good in theory but was perhaps lacking in practicality. Any insights would be welcome. Thanks!