Indeed, but it was definitely time well spent. You certainly know your facts.
Also, I did find the quote I was looking for in Panzer Leader, regarding German defensive fortifications. Although very displeased about having to go on the defensive permanently in the East, Guderian set about trying to solidify German holdings. He says:
"Unfortunately we did not manage to carry out the whole of our Eastern programme successfully. It is true that we did succeed in building the necessary fortified lines and positions, but the indispensable garrisons and weapons were not forthcoming as a result of the catastrophic and rapid sequence of events on the invasion front in the West. The value of the fortifications built there fore remained limited. They further suffered as a result of an order by Hitler that the 'Great Defensive Line,' to which the troops were to withdraw immediately before the enemy launched its attack, was not - as the army groups and I desired - to be some 12 miles behind the normal main defensive line, but was to be build at an insufficient depth of only 1 to 3 miles back." - Guderian 371, 372.
Further he writes:
"The fortifications built on the Eastern Front had meanwhile made our line, long and far too thin as it was, yet sufficiently strong for quiet periods. We did our best to make use of the experience we had gained during the recent battles, but in so doing came up against Hitler's opposition. One essential requirement at the front was that the ordinary main line of defense - to be defended on normal occasions - must be separated from the major line of defense, which was intended to be held in the event of the Russians launching a large scale attack against any one sector. The officers at the front wished to build this major defensive line some 12 miles behind the main line of defense, to camouflage it carefully and to install a holding garrison inside it. They further wanted standing authority to withdraw the bulk of their forces into this major defensive line as soon as the Russian artillery preparation that heralded a forthcoming attack should begin, leaving only rearguards in the old main line of defense; the Russian barrage would thus be wasted, his assault, so laboriously prepared, would be fruitless and by the time he came up against our well-prepared defensive positions he could in consequence be repulsed. There can be no doubt that this theory was absolutely correct. I approved it and submitted it to Hitler. He lost his temper, saying that he refused to accept the sacrifice of 12 miles without a fight and ordered that the major defensive line be build from 1 to 2 miles behind the main line of defense. He was basing his ideas on the conditions prevailing in the First World War when he gave those nonsensical orders and no arguments could bring him to see reason." - Guderian 377.
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