Deng: The strategic policy of the Northern Expedition is to concentrate on destroying the enemy. First of all, March into the two lakes with the main force and destroy Wu; Then led the troops eastward and destroyed Sun Fangchuan; Finally, go north to solve Zhang. The reason why the Northern Expedition marched successfully was that (1) the realization of ethnic cooperation and the establishment of the revolutionary United front, especially the vanguard and exemplary role of the * * * Production Party and the * * * Youth League, were important reasons for the victory of the Northern Expedition. (2 points) (2) The Northern Expeditionary Army received strong support from the broad masses of workers and peasants. The Northern Expedition was a just revolutionary war under the slogan of anti-imperialism and anti-warlord. Realizing national independence and reunification is the common aspiration of the people of the whole country. (2 points) 3) The Northern Expedition received all kinds of assistance from the Soviet government, especially sending military advisers to help the Northern Expedition troops formulate correct military strategies and tactics. (2 points)