Simple typographical errors were corrected; unbalanced quotation marks were remedied when the change was obvious, and otherwise left unbalanced. The hierarchical structure of the Table of Contents does not always match the structure of the main text. Transcriber has not changed this. Illustrations in this eBook have been positioned between paragraphs and outside quotations. The descriptions of the Nobel and Brock lighters on pages 108 and 110 were treated as footnotes by the Transcriber, who added appropriate anchors to them in the text. End of the Project Gutenberg EBook of Trench Warfare, by Joseph Shuter Smith