事实上，蒋介石直到北伐前夕，对北伐仍是十分犹豫不定的。1926年5月，广西的军队已在衡阳一带打得炮火连天，李宗仁于10日抵达广州，劝蒋北伐，蒋居然说：“你初到广州，不知道广州的情形太复杂……现在如何能谈到北伐呢？”李跟蒋反复辩论很久，蒋的态度仍是十分踌躇。(见《李宗仁回忆录》，第200―201页)后来，李宗仁说动第四军军长李济深，始助长北伐的声势。同时二李明告蒋，推举他为北伐的总司令。其实最有力的荐蒋者，乃是俄国顾问鲍罗廷。鲍顾问于中山舰事变后，为了“团结”，刻意姑息蒋介石。5月间，蒋逼走胡汉民，逮捕吴铁城、欧阳格做替罪羊，将他们与熊克武等一起关押在虎门要塞的横挡炮台。(见《郭汝槐回忆录》，第17页)鲍罗廷当然十分欣慰，即向莫斯科报告：“右派受到了严重的打击，不得不放弃他们的阴谋。”(杨天石《寻求历史的谜底》，第469页)于是鲍罗廷大力动员蒋出任国民革命军的总司令。蒋“惶愧力辞”！俄国老毛子不懂“惶愧力辞”的传统中国文化，竟然以去就力争，声言蒋如不就，他也不愿意担任顾问，大有同进退之意。(参阅《蒋介石日记类抄？军务》1926年6月3日)国民党中央党部虽于6月4日任命蒋介石为总司令，(但)仍无北伐的迹象，直至7月1日才下北伐动员令；到7月9日才在广州举行大规模的誓师典礼，由孙科捧孙中山遗像，国府主席谭延授印，以及监察委员吴稚晖献旗；到7月下旬蒋介石才离开广州，鲍罗廷在欢送宴会上仍然号召“在蒋同志之下，共同前进，打倒敌人”。(见上海《民国日报》1926年7月20日)
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