This is the 3287th most frequent Japanese word.
征
"征" means "conquest," "subjugation," or "expedition."
In this sentence, "征" is used as part of "征服" (conquest), denoting the act of conquering or subjugating.
彼は新しい土地を征服するために出発しました。
He departed to conquer new lands.
Here, "征" appears in "征伐" (subjugation), referring to punitive or military actions.
古代では、多くの国が他国を征伐しました。
In ancient times, many nations subjugated other countries.
The term "征旅" utilizes "征" to reflect the idea of a journey or expedition, often with an underlying sense of exploration or conquest.