So, let's start with episode 1 of Sengoku Basara.
In this episode they introduce us to the leaders of some of the different regions that are residing in Japan at that period. This is important as it establishes which will be the participating characters in the story to come.
The anime starts with Date's flaring engrish (wich I personaly love and enjoy). This represents the influence that the Western countries had on Date's life. We are later presented with the first main rivalry in the series, the Takeda clan leaded by Shingen Takeda and the Uesugi clan with Kenshin Uesugi. This two characters meet at the battle of Kawanakajima, one of the most important battles in the Sengoku era. They both are presented as great insightfull leaders and respectfull of each other. This battle, in the anime, is interrupted by a second one that was being fought at a mountain nearby. This one consisted of Yukimura Sanada against his recently met rival, Masamune Date. This battle erupted after Date was planning to attack Uesugi at the mountain top but Takeda foresaw this move and sent Yukimura to stop him, not taht he told him what his mission was. This battle shows the spirit of both characters and how meeting each other makes them give their best and grow. Yukimura and his steel will faces the playfull yet powerfull Date. This battle is interrupted by the head of the Takeda's spy squad, Sasuke Sarutobi and Katakura Kojuro, Date's right hand. Kojuro represents the perspective that Date is missing, especially when it comes to strategy. This battle leaves both contendants with a strong impression of each other and the will to meet and face again.
As the episode comes to an end we can also appreciate the kind of relationship that Yukimura has with his general Takeda. This comes as unbreakable loyalty and admiration from part of Yukimura. However Takeda seems to have more plans for Yukimura than just being his follower, since he keeps instructing him (nothing better than a punch to face to correct his errors) and encouraging him to be a better man to one day become a general himself.
The episode ends with Date using Takeda's tactics to lead him into trouble and at the same time annoying Yukimura a bit more.
On a side note, I had forgotten how great the OP song was ^^.