Le Scaramouche wrote:=
"...The title comes from Kipling doesn't it? ..."

It's from "Recessional"

"...The tumult and the shouting dies;
    The Captains and the Kings depart;
Still stands Thine ancient sacrifice,
    An humble and a contrite heart.
Lord God of Hosts, be with us yet,
Lest we forget — lest we forget!..."