ShiroKobbure
Still modding Civ3
I'm not sure what double handed sword/swords your talking about.so shiro, the double hand sword was used already very early, has it something to do with korea, i have often seen there similar swords...
Chokutō (straight sword)
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Tachi
9th/10th century to 16th century
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curved sword, mainly for cavalry, use one or two handed.
The tachi developed into the shorter uchigatana in the 15th century
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The Katana was used from the 17th century to the 19th century
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Longer swords such as the Ōdachi was developed in the 14th century
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Shields probably disappeared from Japan when from the 5th century onwards horses became more and more important to warfare. Archery became the primary weapon for the warrior class. And for the foot soldiers, they carried long pole arms. The sword was mostly a side arm. And would have been difficult to move in between the weapons with a shield. And the most Japanese shields were large, maybe for defending against arrows instead of swords or spears.
200BC - 800AD
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Iron shield and wooden shields
Post 9th century
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There were occasionally smaller handheld shields, even a few examples of round shields. But mostly shields died out.