The public proclamation of Islam by the Holy Prophet led to a great crisis. The people were not prepared to accept any change in their age-long beliefs, and the Holy Prophet was not inclined to relax or spare any effort in the fulfillment of the great mission that had been entrusted to him by God. Thus began a battle between truth and falsehood. It was an extraordinary battle in the annals of mankind. In this battle waged under the command of the Holy Prophet, Ali was the right hand man of the Holy Prophet and was always in the forefront of the struggle. As in the subsequent battles fought between the Muslims and the pagans in the conventional style, Ali proved to be a warrior of extraordinary valor whose sword put hundreds of the unbelievers to death. It appears that at this stage during the second decade of seventh century when the stage was set for a conflict between truth and falsehood, Ali received some sort of military training which stood him in great stead in the following years of his life, marked by open warfare between the Muslims and the pagans.