diff --git a/client/public/stylesheets/style/style.css b/client/public/stylesheets/style/style.css
index deafa238..f8f1a1be 100644
--- a/client/public/stylesheets/style/style.css
+++ b/client/public/stylesheets/style/style.css
@@ -687,6 +687,19 @@ nav.ol-panel> :last-child {
     width:10px;
 }
 
+@keyframes lock-prompt {
+    100% {
+        opacity: 1;
+    }
+    0% {
+        opacity: 0;
+    }
+}
+
+.ol-navbar-buttons-group > .protectable > button[data-protected].lock.prompt svg {
+    animation: lock-prompt .25s alternate infinite;
+}
+
 .ol-navbar-buttons-group > .protectable > button.lock svg.locked * {
     fill:white !important;
 }
diff --git a/client/src/unit/unitsmanager.ts b/client/src/unit/unitsmanager.ts
index 486d7982..efb26e2b 100644
--- a/client/src/unit/unitsmanager.ts
+++ b/client/src/unit/unitsmanager.ts
@@ -260,6 +260,10 @@ export class UnitsManager {
             if (options.showProtectionReminder === true && numProtectedUnits > selectedUnits.length && selectedUnits.length === 0) {
                 const messageText = (numProtectedUnits === 1) ? `Unit is protected` : `All selected units are protected`;
                 (getApp().getPopupsManager().get("infoPopup") as Popup).setText(messageText);
+                //  Cheap way for now until we use more locks
+                let lock = <HTMLElement>document.querySelector("#unit-visibility-control button.lock");
+                lock.classList.add("prompt");
+                setTimeout(() => lock.classList.remove("prompt"), 4000);
             }
 
             if (options.onlyOnePerGroup) {
@@ -811,7 +815,7 @@ export class UnitsManager {
      * @returns 
      */
     selectedUnitsDelete(explosion: boolean = false, explosionType: string = "") {
-        var selectedUnits = this.getSelectedUnits({ excludeProtected: true }); /* Can be applied to humans too */
+        var selectedUnits = this.getSelectedUnits({ excludeProtected: true, showProtectionReminder: true }); /* Can be applied to humans too */
         const selectionContainsAHuman = selectedUnits.some((unit: Unit) => {
             return unit.getHuman() === true;
         });