British tactics for trench assault parties, using grenades and bayonets. Diagram from "The Training and Employment of Grenadiers", autumn 1915 :

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Bibliographic Details
Corporate Authors: 1915 (Author), Adam Matthew Digital (Firm) (digitiser.)
Format: Electronic
Language:English
Published: Marlborough, Wiltshire : Adam Matthew Digital, 2011.
Online Access:Click for online access
Description
Item Description:This shows how a trench might be cleared by a grendadier party, with the enemy being 'rolled up' rather than attacked frontally. The party is led by two 'bayonet men', followed by a 'thrower' and 'carrier', and then by the NCO. A second thrower/carrier team follows him, followed by two 'spare men', and then by a support party with sandbags etc. for building quick barricades across the end of the cleared section of trench.
AMDigital Reference: Trench_2.
Physical Description:1 online resource
Source of Description, Etc. Note:Online resource (viewed on October 15, 2018).