It's also interesting to consider that the quote comes in the context of Britain's wars in Afghanistan and later that same year the United Kingdom would be engaged in yet another imperial scheme in the First Boer War.
“We are up to the hilt advocates for peace, and we earnestly war against war. I wish that Christian men would insist more and more on the unrighteousness of war, believing that Christianity means no sword, no cannon, no bloodshed, and that, if a nation is driven to fight in its own defence, Christianity stands by to weep and to intervene as soon as possible, and not to join in the cruel shouts which celebrate an enemy’s slaughter. . . . Today, then, my brethren, I beg you to join with me in seeking renewal.”
From An All-Round Ministry, (Charles Spurgeon’s Annual Conference Addresses at the Pastors College), “A New Departure.” [SIXTEENTH ANNUAL CONFERENCE, Spring 1880]