There's a thing that you must not neglect when weaker and on the defence, even if this means neglecting everything else; reconnaissance and surveillance. The less assets you have, the more crucial it is to know how best to use them, and when to extract them from a crisis situation. You need knowledge about the enemy more than ever.
It's quite the same at low force density (few troops in a large region); some small element may encounter a superior hostile element any time because troops are not evenly dispersed. Local inferiority emphasises the importance of knowledge about the enemy. It's essential to avoid superior forces (or to delay them) and it's essential to extract a weaker element in a situation of impending doom.
The other ingredient is artillery, since it potentially covers a large area (or frontage) with its fires and is the quickest reinforcement for a locally inferior force.
General Otis, who had lived on that terrain, was also concerned about the ability of the two weak brigades to hold or even to cover 20 kilometres of ground. General Balck countered by saying that he would rely heavily an artillery in this sector.
(quote source; a wargame report from 1980)
There's still no major arms racing despite heavy mechanised forces and artillery have become fashionable in European NATO again. War scenarios for the defence of NATO (= what matters for conventional deterrence) are still showing a lower force density than the Cold War's Central European scenarios where a mere 26 NATO divisions faced a superior quantity of WP divisions on a roughly 1,000 km wide front for the first week. One brigade per 10-15 km frontage was a thin 'line', nowadays it's not unreasonable to expect temporary gaps as wide a a hundred km between brigades.
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This should lead to a preference for scouting/skirmishing and artillery forces for "first two weeks of conflict" NATO ground forces in my opinion.
Instead, we see indications that more tank battalions and more artillery battalions will be raised in Germany after there was a perceived need to raise more infantry (Jäger) battalions during the Afghanistan occupation years. I have no knowledge of accurate plans (and doubt there are such plans yet), but there seems to be a neglect of scouting.
I write "scouting" for a reason; "observation" is not neglected. There are fine observation vehicles and (old) battlefield radars in use. Maybe the long range recon patrols (Fernspäher) should be more numerous (and accordingly less "special"), but overall surveillance and observation have gotten a lot attention post-Cold War. Technological progress was happening, and it was fashionable to exploit it (long range thermal cameras mostly).
It's the scouting part that's missing. Germany gave up the Luchs 8x8 vehicle years ago (out of service since 2009). It was quite silent, but its concept was stuck in the 1930's**. Nowadays we'd need something with a better gun, with better sensors, much smaller and with 360° camera coverage instead of a second driver for driving backwards. Sadly, there's no such vehicle available off-the-shelf that doesn't have the drawback of a too high ground pressure. It seems that either the expectations for the armament or the expectation for smallness won't be met. We have a choice between something Panhard VBL-like*** with a light armament (no more than a 20 mm gun such as the M621) and something as big as the Panhard SPHINX****.
It doesn't quite seem as if the doctrinal mistake of giving up scouting and focusing on surveillance & observation is going to be corrected in Germany and several other European countries (obviously excluding France) any time soon. The fashionable status of conventional land forces for deterrence should have led to more attention on scouting, but it doesn't seem so.
This may be because of the hopes on aerial drones as eyes in the sky. Aerial drones will not deliver persistent surveillance over a European battlefield, though. Much less will they be able to do true scouting here in the 2020's. They won't look into garages and sheds, under bridges, into buildings, talk to civilians, judge the state of foliage-covered forestry roads et cetera. This may become feasible in the long term (2030+), but that's a mere possibility and the gap is real. We shouldn't need to parcel out main battle tank trios for (noisy!) scouting while we have but a couple hundred of those.
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This was so far mostly about "economy of force"; the weak forces that avert disaster in most places with as few assets as possible so the Schwerpunkt actions can be as powerful (irresistible) as possible.
I'd like to add that this temporal parallelism is not necessary, and at times not even advisable. We should strive to shape the battlefield in our favour before seeking a battle***** - battles should be decided ahead by preparations, not during the battle itself. This means that the conceptual and doctrinal Schwerpunkt should be on those forces that shape the battlefield in our favour. Scouting and skirmishing forces attached to corps or theatre command may do this by reconnaissance, counter-reconnaissance and interdiction of supply flows.
We should pay more attention to such scouting, skirmishing and raiding forces. MBT battalions represent a brute force approach that befit the targets of a strategic surprise attack much less.
one more link to a related post:
*: Attack helicopters were believed to be very quick reaction forces during the 1970's (Brossolet et al) under the impression of experiments which yielded an exaggerated estimate of attack helicopters' lethality against tanks and before army officers began to understand how easy it had become for fighters to kill helicopters even at treetop altitudes. Helicopters are slower than artillery anyway; Artillery may intervene in a 4 minute skirmish 30 km away, while helicopters would arrive several minutes late.
**: Daimler Benz had a prototype 8x8 of such a concept in 1927 and the Büssig-NAG Sd.Kfz 231 of 1937 was almost identical to the Bundeswehr's Luchs in its concept.
***: SPHINX and many other scout cars neglect the ability to comfortably and quickly dismount one scout to inspect buildings, climb to a better vantage point, look under a bridge and so on.
****: Germany could upgun its Fennek, but its ground pressure is too high for soft soils without a substantial armament already. There are plenty soft soils in Eastern Europe, even in summer.
*****: I reject the inflationary use of the word "battle" for just about every firefight. I don't count anything smaller than a contact with more than a thousand dead as a "battle". Anything smaller is a "skirmish" (Scharmützel) at most..