3 sentences for 集结 (jí​jié — mass)

1. 敌军正在边境地带秘密集结。

   dí​jūn zhèng​zài biān​jìng dì​dài mì​mì jí​jié.

   Enemy forces are secretly massing along the border.

   Source: Dong Chinese Dictionary

2. 赶快集结军队。

   gǎn​kuài jí​jié jūn​duì.

   Quickly gather our army.

   Source: OpenSubtitles

3. 这群叛徒在偏远山区集结，企图发动武装叛乱。

   zhè qún pàn​tú zài piān​yuǎn shān​qū jí​jié, qǐ​tú fā​dòng wǔ​zhuāng pàn​luàn.

   This group of rebels gathered in a remote mountainous area, attempting to launch an armed insurrection.

   Source: Dong Chinese Dictionary