Another accusation labelled against him was fear and weak leadership. Fear was something unknown to the Imam who at every crucial turn, since the beginning of the Prophet\'s mission, had shown his courage and leadership prowess. It was these qualities which made him not to start any battle or a bout of single combat against any adversary till the argument was complete. In order to avert bloodshed and to keep the door of guidance open he would listen to what the opposing side had to say. These were the qualities of a wise and astute leader. Yet these ignorant elements whose hands were always on the hilt of their swords were accusing him of fear," because he preferred to engage in dialogue before taking any action. These reluctant converts from idolatry were claiming that his leadership was weak and that he was afraid of death. Imam \'Ali (A.S.) replied to them in the following words:
"Well, as for your idea whether this (delay) is due to my unwillingness for death, then by Allah I do not care whether I proceed towards death or death advances towards me.59
In reply to those who alleged that his behaviour was suspicious against the Syrians, he said:
As for your impression that it may be due to my misgivings about the people of Syria, well, by Allah, I did not put off war even for a day except in the hope that some group may find guidance through me and see my light with their weak eyes. This is dearer to me than to kill them in the state of their misguidance although they would be bearing their own sins."60
On other occasions the enemies - some of whom were in the midst of his own forces - said that although he was brave he was a weak commander and does not know the technique of war. Imam \'Ali has given them a fitting reply by exposing their own cowardice and fickleness and recounting his prowess in leading armies into the battlefield:
Jihad is one of the doors of paradise, which Allah has opened for His chosen servants. It is the dress of piety and the protective armour of Allah and His trustworthy shield. Whoever abandons it Allah covers him with the dress of disgrace and the clothes of distress...Beware! I called you to fight these people night and day, secretly and openly, and exhorted you to attack them before they attacked you, because by Allah, no people have been attacked in the hearths of their homes but they suffered disgrace; but you put it off to others and forsook it till destruction befell you and your cities were occupied...You have become the target at which arrows are shot...You are being attacked but you do not attack. Allah is being disobeyed and you remain agreeable to it. When I ask you to move against them in summer you say \'it is hot weather spare us till the heat subsides\'. When I order you to march in winter you say \'it is severely cold gives us some time till cold clears from us\'. These are just excuses...You shattered my counsel by disobeying me and leaving me so much so that the Quraysh started saying that \'Ali ibn Abi Talib is brave but does not know (the tactics) of war. Allah blesses them. Is anyone of them braver in war and older in it than I am. I rose for it (battle) although yet within twenties, and here I am, having crossed sixty, but one who is not obeyed can have no opinion.61
source : http://shiastudies.net/article/english/Article.php?id=5454