Meaning of 'Circle the wagons'

If you circle the wagons, you stop communicating with people who don't think the same way as you to avoid their ideas.  It can also mean to bring everyone together to defend a group against an attack.

Examples:

During the board meeting, we're circling the wagons to defend our merger strategy against external criticism.

In response to the scandal, the community is circling the wagons, showing unwavering support for the local charity.

As the deadline approaches, the team is circling the wagons to ensure the project's successful completion.

Amidst environmental protests, the corporation is circling the wagons to protect its public image and investor interests.

When cyber attacks were detected, the IT department started circling the wagons to safeguard sensitive data.