@zek777: This is not really correct. For example there were others who remodeled the use of cavalary in Japan towards a shock role instead of the skirmish role. New types or armors and weapons were also rapidly adapted. Such as guns for sieges. Mail armor. Curases. The switch from naginata to yari as weapon for mass warfare, making their infantry formations much like the Gewalthaufen in europe.
Regarding sieges: Read the manga Sengoku. It has a great attack on a small castle, the tactics are pretty much modern stuff. Get close under cover, use grenades to take out towers, break open or get over defenses quickly and alpha strike the troops inside.
Also catapults would be rather useless for many japanese castles. They used several layers of defenses. Inbetweens were build labyrinth like to ease defense. Just lobbing stones from the outside won't do much.
As for your boner for da vinci: Well he was more or less the only out of the box thinker at that time, you overestimate europe. It also was very stagnant for long times.
Also the 30-year war was 1618-1648. The Tokugawa shogunate 1603 - 1868. Not much time had passed since the establishment of the shogunate. Sort of ok from a story point of view.
@duylinh: Holy shit are you projecting much. Let me guess, white nationalist? xD
Japan freshly came out of a several century free for all melee at that time. The time that would it make peaceful compared to europe layed before it.
Regarding the Katana: The european swords in use have thin blades as can be seen. Whenever he cuts someone open, he does so though weak points like the sides of a curass. Never just cutting steel in half.
The point of the damn story is that their guns (MC and antagonist) are special. Did you even read it? Is this plausible? Under Rl metrics? Not really. But under the rules set up by the story? Why not? We did not see other guns perform as well as their two.
You realize that europeans also were a lot smaller then? Try visiting historical buildings from that time. Furthermore the MC is nobility , not commoner like the pirates you discribe. Nobles always had better nutrition everywhere on earth, thus tended to be bigger.
As for the roofs: They cut them from he inside, tilting only works from the outside. They also do not use "spears" but helebards. Those have much more mass.
"The myth that Asian nations could be fighting on equal footing to European military shall be continued by the Japanese until the end of time." Mongols, Arabs, Persians, Ottomans and Seljuks say hi. Each of the mopped the floor with many "western" armies of their times.
"Western civilizations are heads and shoulder above the rest of the world in fighting. " - Seek help man, your world view is beyond simple minded.
"The Japanese avoided colonization because they bowed to the warship and not trying in vain to reclaim some sort of pride. " - Wrong, see above. Learn some history.
"The best show the Asian ever held was actually the Chinese during the Korean War, at the cost of massive casualties. " - Also Vietnam. As for Korea: China was fresh out of it's civil war, they had lots of people with battle experience but the military infrastructure was in shambles. They had for example no air force. Yet, those veterans wrecked the murricans so hard, that only the UN soldiers, the US looked down uppon saved the US forces from getting destroyed as a fighting unit. Again your view on history is very simple minded.
As for Vietnam: A recently independent nation defeated a coalition of the biggest military on earth and large contingents of its puppet regimes. After defeating its colonial overlord, hard. Both while having only a miniscule fracture of the military capabilities of each france and the US.
"Self delusion would only lead to ruinous result." - I give that right back at you. Your view of history fits it well.