4. Mule tracks will be a divisional responsibility.
5. Artillery advancing with the 5th and 4th Australian Divisions will carry forward a proportion of bridges. Arrangements should be made as soon as possible for the development of tracks, making use of the routes taken by the artillery over these bridges.
6. The Amiens—Longueau—Villers-Bretonneux main road, as far east as the cross roads in N.26.c., will be reserved for the exclusive use of the Cavalry Corps from 9.30 p.m. on Y/Z night until 8 a.m. on Z day. After 8 a.m. on Z day it will be available for the Australian and Cavalry Corps.
Assistant Provost Marshal, Australian Corps, will arrange for the control of the traffic on this road throughout.
Chief Engineer, Australian Corps, will prepare short avoiding roads at the cross roads at N.26.c. to cross the north-east or south-west corner to avoid congestion at this spot.
Battle Instructions No. 9
LIGHT SIGNALS, MESSAGE ROCKETS, SMOKE
1. Light Signals.
(a) Australian Corps.
The following Light Signals will be employed in the Australian Corps:
S.O.S. Signal, No. 32 grenade—showing green over green over green. Allotment 500 per Division.
Success Signal, No. 32 grenade—showing white over white over white. Allotment 600 per Division.
A small reserve of each of these grenades is held at Corps Headquarters.
No other Light Signals will be laid down by Corps. There is no objection to the use within Divisions of a Very Light for the local indication of targets between Infantry and Tanks.
(b) Other Formations.
Light Signals of other formations are as follows:
Formation. Signal. Meaning. (i) Cavalry Corps. White star turning "Advanced troops to red on a parachute of Cavalry are fired from here." 1½" Very pistol. (ii) Third Corps. No. 32 grenade, "S.O.S." green over green over green. No. 32 grenade, "Success signal, white over white i.e., we have over white. reached objective." One white Very "Barrage is about light. to lift." (iii) Canadian Corps No. 32 grenade, "S.O.S." will also red over red mean (a) "We are over red. held up and cannot advance without help." (b) "Enemy is counter-attacking." No. 32 grenade, "(a) Lift your fire. green over green We are going to over green. advance. (b) Stop firing." Three white Very "We have reached lights in quick this point." succession. Remark.—In the case of (a) a smoke rocket (No. 27 grenade) will also be fired in the direction of the obstruction to indicate its position.
(c) Special care must be taken by the Artillery on the right flank of the Corps that all officers and N.C.O.'s are acquainted with these signals, so that no mistake may arise as regards the difference in the S.O.S. Signals of the Australian and Canadian Corps.
S.O.S. Signal, No. 32 grenade—showing green over green over green. Allotment 500 per Division.
Success Signal, No. 32 grenade—showing white over white over white. Allotment 600 per Division.
| Formation. | Signal. | Meaning. |
| (i) Cavalry Corps. | White star turning | "Advanced troops |
| to red on a parachute | of Cavalry are | |
| fired from | here." | |
| 1½" Very pistol. | ||
| (ii) Third Corps. | No. 32 grenade, | "S.O.S." |
| green over green | ||
| over green. | ||
| No. 32 grenade, | "Success signal, | |
| white over white | i.e., we have | |
| over white. | reached objective." | |
| One white Very | "Barrage is about | |
| light. | to lift." | |
| (iii) Canadian Corps | No. 32 grenade, | "S.O.S." will also |
| red over red | mean (a) "We are | |
| over red. | held up and cannot | |
| advance without | ||
| help." (b) "Enemy | ||
| is counter-attacking." | ||
| No. 32 grenade, | "(a) Lift your fire. | |
| green over green | We are going to | |
| over green. | advance. (b) Stop | |
| firing." | ||
| Three white Very | "We have reached | |
| lights in quick | this point." | |
| succession. |