According to a recent book on Price's campaign, Kyle S. Sinisi's "The Last Hurrah," historians have long exaggerated the casualties inflicted in the fighting around Westport on October 21–23, 1864. Sinisi's new estimates are that the Union forces lost 361 and the Confederates 510 men, killed, wounded, or captured, on October 23. However, most sources give the total casualties as 3,000 men, about 1,500 Union and 1,500 Confederate. Another primary source gives an estimate of 400 casualties for the Union and 1,000 to 1,500 for the Confederacy.