In addition, the "Ferdinand" was hampered by flaws such as the lack of peripheral vision blocks, or a machine gun as secondary defensive armament. Apocryphal reports say that Soviet infantry, quickly recognizing this flaw, could easily hide in their trenches until the "Ferdinand" advanced through their lines, then swarm the vehicle with grenades and Molotov cocktails from the sides. However, losses to Soviet infantry are disputed in after-action reports. On the other hand, Heinz Guderian himself complained that the Elefant, much as other failed designs, suffered from lack of close-range protection against infantry assaults.