Quote:
Originally Posted by Griefbringer
I presume that self-propelled artillery pieces could have had their own radio sets, and thus would have been able to spread farther away from each other if necessary.
Speaking of WWII British artillery usage, this site contains a wealth of information:
http://nigelef.tripod.com/
I have only managed to trawl through a small part of it so far.
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Those would usually be positioned at the same sorts of short distances, and would link up using the tank telephones rather like tannoy was used for towed arty.
Remember that in those days, radios operated on networks. They still do today. You do not want administrative gun-laying "chatter" going across a radio network. Frequencies were limited, so the network would be used for the important stuff (FOO to BCP comms etc). Back in the 70s, I participated in a joint fire exercise of 2 mortar platoons operating under one BCP with an observer firing on two separate targets, all on the one radio net frequency. (We had 2 mortar platoons in our battalion, but they were 4 packs, not 6-packs). That was a "fun" exercise for the range safety staff (white hats) to oversee - making sure that a correction for one platoon was not mixed up with the other's etc... And the 2 platoons were deployed side by side in a single line 5-10 metres apart per tube even then.
guns were not positioned far apart in pre-computer days. Otherwise separate calculations had to be made for each and every piece. each calculation would have to be made manually and plotted on the arty board.
Guns also had to be close by and in line of sight so the sights of the key piece could see the others for a process known as
paralleling the sights (or pieces) - been a long while!. There was a mirror extension above the gun sight which you lined up with each subordinate piece's sight mirror. That applied equally to SP arty. That ensured that when each sight was set to a particular azimuth, all the other pieces were also on the same bearing - my "010" is also your "010".
Paralleling the sights off a key piece only works if the guns are close. if the guns are scattered (more than 100m apart probably?) - then
each and every gun would have to be individually surveyed-in. Deploying close together, only the one position (for the key gun) has to be properly surveyed in (use of theodolites and maps etc to determine exact position of a stake that the key gun is placed close by and is sighted to).
That is why guns and mortars were set out in simple straight lines, at regular intervals and
not dotted about the countryside. (There is also the case of battery self-defence against an attack - esp in jungle where a patrol could then easily overrun individual guns so scattered. A concentrated battery can more easily provide sentries, be fed and other administrative things). Also - ammo supply to a concentration of guns is much easier than if they were scattered about. When guns were in position and were likely to be there a while, then tow trucks would retire to a rear position and then be used for administrative stuff - e.g. bringing more ammo up from the rear, rations etc. or the drivers might be detached and used as ammo preparation numbers rather than be allowed to sit around and make tea

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The key piece (the right hand or left hand one depending on army) was the one that was plotted by the BCP. When ranging, it was that piece that fired. The others of the battery were basically "slaved" to that key piece. If there were individual small corrections required e.g. to concentrate the fire of the battery on a point rather than fire parallel, then these were small individual adjustments from the key piece setting, but it still took a bit more time to manually calculate these off the key gun's setting, relay the settings to each gun individually etc.
Dealing with scattered guns really would only become practical once fire control computers began to arrive i the 70s. However even then (and now) - the practicalities of resupply, security and so on etc mean that it's more practical to deploy the guns close together.
The Japanese did have a reputation for deploying singleton guns linked by dug-in field telephones. But responsiveness to fire requests in such circumstances would tend to be low.
The British would deploy the 2 troops of a battery some way apart (150-250 metres) on occasion. They used a simple "link" system - the data for the key gun at the #1 troop would be relayed to the #2 troop, and the BCP there would apply a straightforward triangle correction to its key gun, the others would fire in parallel to that piece. However the UK arty went for speed and weight of response (fire the guns at a high rate with speedy response to the call for fire in the general area, basically with minimal corrections or ranging - and gain a quick neutralisation of the enemy troops) since they believed in suppressive fires. That is why they stuck to the 25 pounder.
The Americans tended to believe in "destruction fire" at this point in time - so preferred the heavier 105mm howitzer, and would take the extra time to plot the "toe in" of individual pieces for a "concentrated sheaf" as well as spending more time on ranging by an observer - the UK would fire the guns in parallel in what the USA termed the "simple" or "parallel" sheaf as soon as they were in 50 yards or so of the target (if observed).
More about what the USA call "sheafs" and as far as I recollect we Brits call "concentration" here
http://www.poeland.com/tanks/artillery/sheafs.html
Cheers
Andy