The poem (whose theme is the education of women) consists of a Prologue, 7 cantos and a conclusion. Home they brought her warrior dead is the first line of a section which stands alone at the end of the fifth canto; Gustav Holst arranged a musical setting for it in 1905.
Home they brought her warrior dead:
She nor swooned, nor uttered cry:
All her maidens, watching said,
'She must weep or she will die'.
A harmonium is a type of keyboard instrument.