On the "modern system" tactical defence and the look forward into a low force density reality

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I think I hinted before that the lack of WW2-esque front lines should have lead to much greater updates to land warfare doctrine than it did. I've recently read again the key chapter (ch. 3) of Stephen Biddle's "Military Power" and would like to present an example argument for my case.Biddle describes what he calls the "Modern System" of land warfare; how to survive firepower in the tactical defence, how to survive firepower in the tactical offence and how to break through and exploit.His "Modern System" is in my opinion both an excellent description for much 20th century warfare and a total misnomer at the same time. I think it's a misnomer because it's not "modern", but far below the potential and behind the times by half a century. We were just lucky to not have experienced a war that exposed the obsolescence of the now traditional doctrines.Biddle assumes that defenders cannot defend a static position without being overwhelmed by firepower (which is correct). He goes on to assume that the defender thus needs to withdraw from his position after brief firefights in order to fight another fight a bit farther back. Or another team needs to do the same. In either case, defence needs depth in order to slow down the breakthrough, delay the beginning of the enemy's exploitation phase and thus enable friendly reserves to launch a promising counterattack.It's a beautiful description of the state of the art defensive system of 1917-late 30's.There's a crucial problem, of course: This very same system wasn't much more than a WW1 Western Front and later a doctrinal system. It was impossible in late 1941 because of overextended forces; there are often simply not enough forces available to defend in depth. Biddle paid much attention to the breakout attempts of the Western Allies in Normandy '44; again a high force density scenario.His "modern system" is valid, save for the exception that it's invalid in low force density scenarios - that is, in most modern warfare.A defending (direct fire) team in a high force density scenario does indeed need to shoot and scoot - and to scoot backwards or at most sideways, for these are the only survivable routes. Backwards 120° is the most likely sector for withdrawal because concealed routes for repositioning are most likely to be found in this sector. The advancing enemy might be able to see other routes an reach them with his unbearable firepower.
This doesn't force it to retreat, to go backwards - to trade ground for blood. It could just as well reposition itself in order to get behind the attacker (an astonishingly effective tactic; tank platoons and snipers who did this in WW2 wreaked utterly disproportionate havoc). There aren't enemies everywhere "in front" of them, after all - there aren't "enough" enemies to restrict their choice of routes as much as in a high force density scenario.
Low force density furthermore lowers the chance that defenders are actually in place in order to meet an attacker. There's probably just a brigade on a 60 km 'front line' - with 20 km per battalion. That's about twice the width allocated to WW2 divisions and easily four times the width that an entire brigade should be assigned to defend in a delaying mission in a high intensity scenario. In short: The presence of defenders might be the exception to the rule. Many attackers could advance on roads using loud, bright red motor scooters and still reach their objective.
Even many higher force densities leave plenty room for infiltration and exfiltration on most terrains. No frontages can be assigned to formations in many conflicts; instead, areas and missions are being assigned. There is simply no front line, thus no portion of a front line can be assigned to a formation (or the other way around).The lack of a high force density front line, a partial collapse of Biddle's modern system tactical defence character and the lacking necessity of a breakthrough phase change very much. Biddle's "Modern system" is obsolete whenever modern forces cannot meet the force densities observed by Biddle in his look back on 20th century land warfare.We should look forward, understand what we need to do without a front line (and its very important functions), what we need to do with the forces that we have today and in the near future. Much has changed.
Again, just as before 1914, we only get partial and often misleading hints from small wars in underdeveloped countries. We need to read these signs, but we also need to reason ahead of the already observed in order to prevent that we're as awfully unprepared in the next great war as we've been in 1914.
S O
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Results of my little poll

. What do you want me to blog about?
Weird military theories 60 (55%)Bikini girls with big (g)uns! 34 (31%)
Almost nobody seems to like my funny video embeds. I'm shattered.The rejection of the civil rights stuff was surprisingly strong, too.What's the point of defending freedom against foreign powers if you don't maintain freedom at home?Bikini girls was not a serious option (even though I decorated two or three blog posts with reduced clothes girls).
S O
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