Early in 1814, with invasion becoming more imminent every day, the urban National Guard was reorganised across the whole of the Empire. 30 pieces of artillery were placed on the walls, and to complete the defense system, trees were felled in the vicinity to make 30,000 palisades and 14,000 shields. On 20 February, a column of cavalry forming the vanguard of the 3rd Corps of the Prussian army, commanded by Baron de Geismar, arrived in Doullens, before heading to Abbeville. Immediately, the Abbevillois ran to arms. 800 rifles were made available and a vigorous resistance began when the population learned that this supposed vanguard of the Prussian army had more than 1,500 to 2,000 men in its ranks, both Cossacks and Saxon Lancers, who eventually made their way to Paris.