In technical terms, I would say the castle is more open to falling from attack, but not so much. The Castle of Nao is located on a fortified array of hills and cliffs, overlooking the the city of Shiro Nao (being also almost totally abandoned by the residents that used to live there). The castle battlements were once well maintained and orderly, but because of the Northern army's combined attacks to control the area have left them battle scarred and dilapidated.
Other than the other reason I gave of Tokugawa immediately setting up an advance against Shiro Nao (he needed to preform more miracles), Tokugawa saw this as a perfect chance to under blow the enemy's morale and gain more allies, convincing the enemy that their retreat was of foolish cowardly nature, that they lost an important asset in controlling the region, and that in the process, the Tokugawan threat has gained new ground and new soldiers. However, Tokugawa must overcome the infamous warlord Satake Koruyi.
The plan to win was to divide the Free Japanese forces into two divisions, two seperate parts: Tokugawa's forces and Yi's forces. Tokugawa's forces (with Sakai) will take the road that avoids Shiro Nao, meeting head on into a full blown battle, meeting face to face against the enemy rear. Because alone, Tokugawa's division outnumber Satake's outer defensive rear, Satake would order his forces out of the otherwise ambush ridden town as well as culminate forces from the other sides into the line of battle. In the meantime, Yi's horsemen and lancers will seem through the city and take Satake's mass of soldiers from behind, surprising them and eliminating them before they can fully adapt and thus win the day. However, sometimes pure strength and willpower can alter even the most ingenious of plans if not considered.
And so the battle begins, Tokugawa's line marching front and center upon the road. As expected, many of Satake's units are positioned in that direction. Tokugawa and Sakai soon called on archers to fire, and fire they did. The enemy soon retaliated with their own arrows and began a charge toward them. Tokugawa then halts his men, his spear men up in the front, and orders those spear men to create a wall of spears, one after another... three rows of spear men ready to plunge into the enemy lines. Their sides were coupled with archers firing at will at the charging crowd.
And there he was, Satake appeared out of the line of troops, sharing the same fate of the rest of his charging men, spear held low, running forward. The enemy soon took this and gained morale and momentum, speeding up. Satake's likeness was something to behold if one wanted to look for a veteran. Battle scarred and intimidating with a unique spiked headpiece and armaments, wielding a heavily barbed spear that was at least 10 feet in length caused some disorder in Tokugawa's ranks as they started to step back. Aware of this happening, Tokugawa dismounted from his horse and came up to the front, grabbing an extra spear, ready to do battle. The soldiers, inspired, stayed firm and returned to their original positions.
The enemy, relieved at first that their leader's menacing appearance and boldness drove their adversaries off, were shocked to find they had came up and tried to pull back and slow down, but it was too late... they were struck by spears and soon the ground beneath Tokugawa's feet started piling. Seeing that his soldiers made no success, Satake made matters into his own hands and shredded through the spear men in his way , with them flying through the air. Tokugawa soon abandoned defensive formations and met Satake in the same way, erupting in a crowded kill or be killed match. Soon, an hour passed with little break between the stalemate, with Satake (as though he felt no physical limitations) continuously hacked and slashed the through soldier upon soldier. Tokugawa's plan started to look bleak as the enemy continued to pummel his troops, with no sign that Satake would call upon extra reinforcements, too sure of himself that he could win the battle alone even without soldiers to aid him. His manpower was certainly depleting, but his strength and skill was certainly not going awry as more hours passed... It was time Tokugawa took things in his own hands, to at least injure Satake in anyway... But was that possible?
To be Continued...