Battle Log
Upon logging in and without a shield, this may appear on your screen:
This means that another player has attacked your base. To check who attacked your base and when the attack occurred, check the Battle Log section to see details about the attack.
The Battle Reports screen shows two tabs. Defense Logs and Offense Logs.
Defense Logs is the default screen that shows up and displays recent attacks on the base. Successful base defenses are in a blue color and failed ones are in a red color. Also displayed here is the name, level and rank, the time elapsed since the attack, damage percentage done to your base along with how many stars were achieved, reputation lost, resources lost, and a replay button and a retaliate button.
The other tab is the Offense Logs.
This tab shows your offense on other player's bases. The details here are similar to the defense log screen except there is no retaliate button.
Selecting a particular attack event will display the units and Heroes used.
From this screen you can also retaliate, visit their base to see their setup and get a feel if an attack is doable. A replay function to play a recording of the attack, and lastly, the share button to share it on social media.