Battle of Messines 1917: Mines, Ridge & Plumer’s Set-Piece Attack — Complete Field Guide

Messines was one of the British Army's most carefully prepared attacks of the First World War: deep mines, predicted artillery fire and limited objectives were combined to seize a ridge that had dominated the Ypres salient.

At 03:10 on 7 June 1917, a series of enormous mines exploded beneath German positions. Infantry then advanced behind a creeping barrage.

Why the ridge mattered

Messines-Wytschaete Ridge overlooked the southern side of the Ypres salient. Capturing it would improve Allied observation and create better ground for the offensive later known as Third Ypres.

The mining war

British, Canadian and Australian tunnelling companies spent months driving galleries beneath German positions. Nineteen mines exploded at the opening of the attack; others failed or were not fired.

Plumer's plan

General Herbert Plumer favoured a methodical battle with clearly defined objectives. Artillery, machine guns, tanks, aircraft and infantry were integrated around a timetable designed to destroy or suppress defences rather than rely on speed alone.

7 June

The explosions shattered sections of the German front and caused enormous casualties. Nine Allied divisions advanced behind the barrage and captured most initial objectives rapidly.

Consolidation

German counter-attacks continued for days, but the ridge remained in Allied hands. Engineers, artillery and reserve infantry turned the captured ground into a defensible position.

Why Messines worked

Preparation, surprise, overwhelming artillery and limited objectives all mattered. The result should not be treated as a universal formula; the terrain and tactical problem were unusually suited to a carefully staged assault.

The road to Third Ypres

Messines removed an important German position but did not solve the strategic problem around Ypres. The much larger offensive that followed is covered in Passchendaele 1917.

Sources and evidence used

• National Army Museum — 1917: Year of Stalemate.
• British official history, tunnelling-company records and Second Army war diaries.

Related Field Notes

• Passchendaele / Third Ypres
• Western Front Campaign Guide