This "would" is translated as "past will", but I doubt if it's a habitual action in the past. This looks dubious. What do you think?

ex)In the sixteenth century, Portuguese missionaries tried for years to convert the people of Japan to Catholicism, while at the same time Portugal had a monopoly on trade between Japan and Europe.., When the Dutch began to arrive in Japan in great numbers, Ieyasu was much relieved. He needed Europeans for their know-how in guns and navigation, and here at last were Europeans who cared nothing for spreading religion - the Dutch wanted only to trade. Ieyasu swiftly drove out Portuguese. From then on, he would only deal with the practical-minded Dutch.