 The guns in the back of the forecastle have defied explanation , but one theory is that they were included to compensate for the guns that were positioned in the <unk> , aiming forwards , but which would have been obscured due to the angle from which the ship was depicted . The list of ammunition , small firearms , longbows , arrows , pikes , and bills closely matches the archaeological evidence . As the source that is closest in time to the sinking of the Mary Rose , it has been of central importance for the archaeological project , especially in estimating the size of the crew . 
