[17] Military features of importance in connection with ground and cover are dealt with in _Drill and Field Training_ and _Field Entrenchments_ of this series. [18] See also Sec. 72, para. 8. [19] See Sec. 28 of _Drill and Field Training_ of this series for information as to _communications_, for which, with information as to _ammunition supply_ see also _Infantry Training 1914_. _Infantry covering fire_ is dealt with in Sec. 44, para. 13, of this book. Arrangements for covering fire by machine-guns are dealt with in _Machine-Gun Training_ of this series (see also _Field Service Regulations_ and _Infantry Training, 1914_). [20] With regard to opening fire, see Sec. 44 paras. 3 to 6. [21] See Preface, para. 11. [22] Sec. 13 should be read in connection with this paragraph. [23] See also Sec. 54, para. 3 (vi). [24] All subordinate commanders are responsible for keeping their respective superiors, as well as neighbouring commanders, regularly informed of the progress of events, and of important changes in the situation as they occur. All ranks should notice what takes place within their view and hearing, and report anything of importance accurately and at once to their immediate superior, who must pass the information on to the higher commanders and to neighbouring units. This is the foundation of co-operation in war, and is essential not only in battle, but at every stage of a campaign.--_Infantry Training, 1914_. [25] The methods by which the development of the soldierly spirit is inculcated in men, and their character developed in discipline and other soldierly qualities, are dealt with in Chapter I of _Drill and Field Training_ of this series. [26] See the _Physical Training_ books of this series. [27] The range duties of officers supervising range practices, together with directions for signalling hits, etc., will be found in _Musketry Regulations_. [28] All men not fully exercised in Table B with their companies (except those referred to in the first sentence of the paragraph to which this note refers) will be attached to other companies to carry out the range or field practices omitted; or, if all companies have completed Table B, a party of casuals may be formed to insure that all men qualified are fully exercised in the whole of Table B. [29] For various arrangements to facilitate night firing, and their combination with automatic alarms, flare lights, and obstacles to increase fire effect and check the enemy, see Chapter VIII., _Field Entrenchments_, of this series (see also Preface, para. 7) [30] See also Sec. 15, para. 3. [31] See _Drill and Field Training_ of this series, Sec. 31, paras. 4 to 8 [32] Solano figures representing Infantry Lines consist of strips containing a number of figures at intervals. Lines made of these figures can be crowded together by overlapping two strips and fixing them together in the clips.