A shield is projected from Endor to the Death Star orbiting it. The Executor has shields, without which it is very vulnerable to attack; concerted bombardment by the Rebel fleet could bring these down without much difficulty. Several critical events during the Battle of Endor display critical weaknesses in Imperial armor against physical impact. Two logs smash an AT-ST handily, and a rogue A-Wing smashes straight through the forward bridge window of the Executor. The Super Star Destroyer's command center was destroyed, and the ship plummeted to its doom, crashing nose-first into the second Death Star. A Y-Wing is also seen impacting an ISD, although without great consequence for the ISD. It is possible that the shields of the ISD were up during that impact. Empirical armor penetration formulae show penetration depth is related to a term that ranges from V2M/A to VM1/2/A1/4, where V is the velocity, M is the mass, and A the area of impact. As the armoring plates' thickness would seem to be substantially lower than the caliber of the large impacting projectiles, the first formula is strongly suggested. Bullet/Gun Type Caliber or Impact Area Mass Impact velocity V2M/A VM1/2/A1/2 Musket, large Musket .80" ~50g ~400 m/s 2.5x107 670 1911 Colt .45 ACP Pistol .45" 250 grain 750 fps 7.9x106 280 AK-47 Assault Rifle 7.62mm 7.4g 715 m/s 8.3x108 3,400 16"/50 mk 7 Battleship main gun 16" 1225kg 762 m/s 5.5x109 6,000 A-Wing Fighter 1m2 ~6000kg ~150 m/s 1.35x108 12,000 Log Dead Tree 1.5m 1.3x104kg 12 m/s 1.0x106 1,200 Y-Wing Bomber 3m2 ~5x104kg ~300m/s 1.5x109 51,000 The A-Wing is particularly problematic; it would appear as though the windows of Imperial ships are unlikely to be able to resist assault rifle fire. Clearly the hulls are more armored; Y-Wing survival suggests a level of protection equivalent to or greater than 8.9" of face hardened steel. The logs, however, condemn the AT-ST. Granted, the AT-ST's armor was not actually penetrated; however, while it is possible that the AT-ST may resist some small arms fire, it is clearly not a heavily armored vehicle.	ST-v-SW: Log smashes AT-ST.