Immediately upon hearing of the disaster Potgieter and Uys collected every available fighting man and crossed the mountains to the relief of their comrades. The Englishmen of Port Natal, or Durban, also offered their assistance. Finally, a force of 347 Boers rode straight for the Zulu capital, intent only on vengeance. After five days' journey they were, however, drawn into an ambush and lost ten men, including Commandant Uys, and much ammunition and baggage. About the same time seventeen Englishmen, leading fifteen hundred friendly natives, of whom some four hundred were armed with muskets, started out to help the Dutch. A little south of the Tugela River they came upon a Zulu regiment, and were in turn drawn into an ambush on April 17, 1838, which resulted in one of the bloodiest battles ever fought in that region of almost continuous conflict. The little force found itself between the wings of a Zulu army numbering at least 7,000 men and with thousands more coming in during the battle. Three times the Englishmen and their little force beat back the enemy. One division, with four white men and four hundred blacks, did fight its way down the steep bank of the Tugela and across the river. The other division, after battling for hours with the serried masses of savage warriors, was finally overpowered and slaughtered. [Sidenote: Natal Overrun by Native Soldiers] Natal was now overrun by Dingaan's soldiers, and the remaining Boer families were gathered together in fortified camps, which the Zulu armies could not carry by storm. [Sidenote: Pretorius in Command]