Five subsidiary works in the intervals between the principal 'forts.' These were not of such strength as the latter, and were for the most part completed but not armed at the commencement of hostilities. They are called in the text 'fortifications.' Certain of the batteries on the land side, and a few auxiliary works--such as redoubts, etc. After the outbreak of war the existing permanent and semi-permanent works were supplemented by a large number of batteries and closed infantry works, in some of which guns were emplaced. These were sited between the other works, or, in some cases, upon special points, and are called 'redoubts' and 'lunettes.' There were also a few open infantry works constructed for the special purpose of 'flanking' others, or for firing over ground in front of them not covered by their own fire. These are here called 'open caponiers,' and should not be confused with the masonry structures called 'caponiers,' placed at the bottom of the deep ditches of the larger works for the defence of those ditches. Round, between, and behind the forts, fortifications, redoubts, lunettes, etc., a maze of trenches grew up for fire, shelter, and communication, and numerous bomb-proofs, magazines, dressing stations, were also built. In front were wire entanglements, live electric wires, land mines--every obstacle that ingenuity could suggest. To assist in identification a table has been prepared in which the Russian and the other names (where available) of the localities mentioned are given. A chronological table of the principal events of the siege has been also added. London, _March, 1908_. TABLE OF NAMES List of Principal Places mentioned, giving their Russian and in some Cases their Other Names.