The above image shows the barrage trace for the exercise. The fire plan was for 25 pdrs and 6” Howitzers to open fire at zero on the opening line for 2 minutes. Is was then to lift at 200 yards per minute. A 'trace' would be issued to the various artillery units taking part and would have simply been placed over a map.
The above shows an example of a trace with two 'lanes' for batteries.
Smoke cover was to be provided by 3” mortars.
Although this exercise was not about artillery training it does provide an example of how barrages were orgainized. Barrages were of two types:
· The wheel method – this ensures that infantry or tanks are brought onto the objective by the barrage. The disadvantage is that troops/tanks have to move at different paces. In the illustration below, lifts are at 100 yards per minute along the greatest distance (line BF), the lift will be less than 100 yards on line AE
· The Echelon method – in each lane the lifts are equal so the pace of advance of troops/tanks is also equal. The disadvantage of this method is that infantry/tanks are not brought onto the objective at the same time.
The barrage in the exercise is an echelon barrage with two lanes.
The start of the demonstration was to take the following form:
· Royal Engineer parties to prepare bridges over the drainage ditch
· Royal Engineer parties to move forward and cut and mark six lanes through the first belt of wire 12 feet wide.
· Lanes to be cleared and marked through first minefield by prodding (three lanes, each lane18 feet wide) and use of polish mine detector (three lanes, each lane 18 feet wide).
This was to be completed in 35 minutes – and following this was to be the crossing of the anti-tank ditch and second minefield. This will be the subject of the next and final post of this exercise.
Above: Polish mine detector (in use in by 8th Army -IWM). Development of this detector was started in Poland pre War but was interrupted by the outbreak of War. A final design was completed by Jozef Kosacki in late 1941 and 'gifted' to the British Army (Source: Wickipedia).